Antique & Vintage
Curta Calculators / Type I & Type II

This is just a sample of the many Calculation Related antiques we have sold.
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Curta Calculators

This.

Type I Curta Calculator Serial No. 21577 This Type I Curta serial # is 21577 and was produced in 1953 a few years after production began.. This Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body is very nice and shows little if any wear or tear. The metal case is in fine condition as well.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line hand held manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1800.00        SOLD!!

Curta Type 1 Calculator w/ Case & Paperwork The serial # on this early Type 1 Curta is 36384. That would date this from approx. 1957. This Curta Calculator is in good condition and operates flawlessly. The body is very nice and shows minimal wear or tear.

The outer metal case shows considerably more wear and losses to the black finish. In addition to the serial number the bottom of the calculator it is stamped Made in Liechtenstein, by Contina AG Mauren, System Curt Herzstark. Dimensions of the outer metal case are approximately 4 5/8" tall by 2 1/4" diameter.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

In todays world they are at times used in road rallies and other applications but they are worth more as collectibles and examples of calculation history. The last examples were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Good + . . . . . $1100.00      SOLD!!

Type I Curta Calculator Serial No. 45462 This Type I Curta serial # is 45462. This Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body is very nice and shows little if any wear or tear. The metal case has a two tone surface as if the top was stripped of its black finish. Not sure why that is.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line hand held manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Good . . . . . $1000.00        SOLD!!

Type II Curta Calculator Serial No. 511565  This Type I Curta serial # is 511565. This Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body is very nice and shows little if any wear or tear. There is a halo from a label or marking on the body of the calculator as shown in the pics. The metal case is very nice.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line hand held manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Good + . . . . . $1450.00        SOLD!!

Type I Curta Calculator The serial # on this early Type 1 Curta is 39999. This Type I Curta Calculator is in excellent condition and operates flawlessly. The body is very nice and shows minimal wear or tear. There are minor scuffs and losses on the outer metal case. The previous owners name was professionally inscribed on the front below the Curta name. I looked up Brett Huggins and was surprised at how many people there are in the world with that name.

In addition to the serial number the bottom of the calculator is stamped Made in Liechtenstein, by Contina AG Mauren, System Curt Herzstark. Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. The inside of the case has original pads top and bottom to protect the device.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

They are at times used in road rallies and other applications but they are worth more as collectibles and examples of calculation history these days. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1095.00     SOLD!!

Curta Serial # 79405 Type I Calculator This Type I Curta Calculator is in excellent condition and operates smoothly and flawlessly. It shows no signs of use. It is as close to minty nice as one could ask for. The previous owner bought it new in the 1970s, and then bought one of those new electronic handhelds before he put this into service. It has sat in a drawer, in its original box, for the last 50 some years. The serial # on this Type I Curta is 79405. The body is very nice and shows no wear or tear. The plastic case is flawless w/ both pads. No scuffs or scratches. Also included is original paperwork, guarantee, and outer box shown.

The Curta calculator was invented by Curt Herzstark during World War II while imprisoned in a German concentration camp. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's and collectible shortly afterward.

In todays world they are sometimes used in road rallies and some other applications but are worth more as collectibles and examples of calculation history. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were produced They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $     SOLD!!

Type II Curta Calculator The serial # on this Type II Curta is 537197. This Type II Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body is very nice and shows minimal wear or tear. There are minor scuffs on the sole, and some dirtiness to the housing above the number slides. I did not attempt to clean it. The plastic case is nice. Also included are the 4 pieces of original paperwork seen.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

In todays world they are at times used in road rallies and some other applications but are worth more as collectibles and examples of calculation history. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1350.00

Curta Type II Calculator Serial # 529370  This Type II Curta Calculator is in excellent condition and operates smoothly and flawlessly. The serial # is 529370. The body is very nice and shows minimal wear or tear. The metal case is nice noting the top bumper inside was missing and has been replaced with some appropriate foam. Also included are the 2 pieces of original paperwork not shown.

The Curta calculator was invented by Curt Herzstark during World War II while imprisoned in a German concentration camp. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's and collectible shortly afterward.

In todays world they are sometimes used in road rallies and some other applications but are worth more as collectibles and examples of calculation history. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were produced They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1495.00             SOLD!!

Curta Type I Calculator w/ Box & Paperwork  This is one of the finest condition Type I Curta Calculators I have ever handled. It has its original cardboard case as well as the original guarantee card from the store it came from, plus the 2 typical pieces of instructional paper, the manual and a quick start guide one finds. It shows little if any wear and looks to have seen little if any use. It operates flawlessly.

This Type I Curta calculator has serial number 46797. The cardboard box has a label with the same number. The paperwork indicates it was first sold in the early 1960s. There are sites online that are devoted to the science of dating these where one can determine a more precise production date. The outer case is metal and both pads are present. On the bottom of the calculator is written "Type I No 46797 Made in Liechtenstein Customs Union with Switzerland, by Contina LTD Mauren, System Curt Herzstark,

The Curta Calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II and was the calculator of choice before the advent of electronic calculators ended their run in that sense and they became a much sought after collectible of today.

Fine. . . . . $1100.00    SOLD!!

Curta Type I Calculator This Curta Type I calculator is in good condition and operates properly Scuffs on the bottom plate.

This Type I Curta calculator has serial number 64042. There are sites online that are devoted to the science of dating these where one can determine the production date. The outer case is plastic and good noting the bottom foam pad has been replaced.

The Curta Calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says "Type I No 64042 Made in Liechtenstein Customs Union with Switzerland, by Contina LTD Mauren, System Curt Herzstark,   

Good . . . . . $725.00      SOLD!!

Type I Curta Calculator The serial # on this Type 1 Curta is 58752. This Type I Curta Calculator is in excellent condition and operates flawlessly. The body is very nice and shows minimal wear or tear. There are minor scuffs and losses on the outer metal case.

In addition to the serial number the bottom of the calculator is stamped Made in Liechtenstein, by Contina AG Mauren, System Curt Herzstark. Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. The inside of the case has original pads top and bottom to protect the device.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's. In todays world they are at times used in road rallies and other applications but they are worth more as collectibles and examples of calculation history. The last examples were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1000.00         SOLD!!

Type II Curta Calculator The serial # on this Type II Curta is 520722. This Curta Calculator is in excellent condition and operates flawlessly. The body is very nice and shows minimal wear or tear. The outer metal case is marked Blackett the original owners name.

In addition to the serial number the bottom is stamped Made in Liechtenstein, by Contina AG Mauren, System Curt Herzstark. Case dimensions are approximately 5" tall by 2 3/4" diameter. The inside of the case has original pads top and bottom to protect the device.

Curt Herzstark developed the idea while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator in the 70's which made them obsolete.

In todays world they are at times used in road rallies, and other applications, but they are worth more as collectibles and examples of calculation history. The last examples were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. Curta Calculators are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1450.00     SOLD!!

Curta Type II Calculator  This Curta Type II calculator is in fine condition and operates flawlessly. Minor scuffs on the bottom plate. The Curta calculator was the most popular unit available right up till hand held electronic models were offered in the early 70's. They became about obsolete but highly collectible look back into the past after that.

This Type II Curta calculator has serial number 552801 which would date it from a few years before the end of their production. There are sites online that are devoted to the science of dating these where one can narrow the date down. The outer case is plastic and good noting the foam pads have gone missing.

The Curta Calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says "Type II No 552801 Made in Liechtenstein Customs Union with Switzerland, by Contina LTD Mauren, System Curt Herzstark,

Fine . . . . . $1095.00      SOLD!!

Curta Type II Calculator # 558022 This is a very nice Type II Curta calculator. The serial number 558022. It is a later model and has the two tone color scheme on the body. The original fold out instruction sheet and manual show some typical wear. They are dated 1974. Cosmetically this Curta is very nice with some minor scuffs on the bottom. It functions smoothly and flawlessly. The black plastic case with its rubber bumpers is in great condition as well.

The main difference between a Type 1 & 2 are the number of places it has. The type II Curta has a larger capacity than the type 1, with 11 columns that carry out to 15 places. It is pretty incredible that they were able to get all that capacity and capability to fit into the palm of a users hand. Both types were both being offered simultaneously although the Type 1 was introduced first a few years before the Type 2 came to market.

The Curta calculator is one of the most interesting designs of manual calculators ever designed. Before the advent of hand held electronic calculators they were cutting edge technology and the final word in mechanical calculators.The introduction of the hand held electronic calculator ended the Curtas reign as the calculator of choice for use, and began it accent into the realm of one of the most sought after collectible calculating devices.

These devices were first invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is the manufacturer info, and it says Made in Liechtenstein, (Customs Union with Switzerland.) by Contina LTD. Mauren System Curt Herzstark. The black plastic case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. Inside of the black plastic case has both foam pads to protect the device.

Fine . . . . . $1295.00      SOLD!!

Curta Type II Calculator # 525210 w/ Box & Paperwork This is a very nice Type II Curta calculator. The serial number is 525210. It comes in the original cardboard box and associated paperwork. The original fold out instruction sheet and manual are nice. The box shows age.

The type II Curta has a larger capacity than the type 1, with 11 columns that carry out to 15 places. It is pretty incredible that they were able to get all that capacity and capability to fit into the palm of a users hand. Before the advent of hand held electronic calculators Curtas were cutting edge technology and the final word in mechanical calculators. These devices were first invented by Carl Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is the manufacturer info Made in Liechtenstein, (Customs Union with Switzerland.) by Contina LTD. Mauren System Curt Herzstark.

All aspects of this Curta are very nice. It functions smoothly and flawlessly. The black metal case with its rubber bumpers is in great condition. The black metal case measures approximately 4 5/8" tall by 2 1/4" diameter. The case has both foam pads to protect the device.

The Curta calculator is one of the most interesting designs of manual calculators ever designed. The introduction of the hand held electronic calculator ended the Curtas reign as the calculator of choice for use, and began it accent into the realm of one of the most sought after of collectible calculating devices. The end of an era!!

Fine . . . . . $1695.00           SOLD!!

Curta Type 2 Calculator   This Curta calculator is in super condition, and operates flawlessly. Inside of case has both foam pads to protect the device. The Curta was the most popular unit available right up till hand held electronic models were offered in the early 70's.  They became an obsolete but highly piece of calculation history after that.

This Type II Curta calculator has serial number 553456 which would date it from a few years before the end of their production. There are sites online that are devoted to the science of dating these where one can narrow it down.

The Curta Calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says "Type II No 553456 Made in Liechtenstein Customs Union with Switzerland, by Contina LTD Mauren, System Curt Herzstark,   Inside of case has both foam pads to protect the device. Also included is an original paperwork.

Fine . . . . . $1250.00      SOLD!!

Curta Type 1 Calculator This interesting design calculator is in super condition, and operates flawlessly. This Type 1 Curta calculator has serial number 64194 which would date it from near the end of their production. There are sites online that are devoted to the science of dating these.

The Curta Calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says "System Curt Herzstark, Made in Liechtenstein, by Contina AG Mauren, Type 1 No 64194. Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. Inside of case has both foam pads to protect the device. Also included is an original instruction sheet that was provided with it.

Fine . . . . . $1050.00      SOLD!!

Curta Type 2 Calculator w/ Leather Carrier  This interesting calculator is in super condition, and operates flawlessly. The Curta was the most popular unit available right up till hand held electronic models were offered in the early 70's.  They became an obsolete but highly collectible look back into the past after that.

This Type II Curta calculator has serial number 547782 which would date it from a few years before the end of their production. There are sites online that are devoted to the science of dating these where one can narrow it down. The outer case has a Lietz decal, and the leather case typically indicates it was being used by a surveyor or engineer in the field. The leather case is nice noting the snap closer no longer works.

The Curta Calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says "Type II No 547782 Made in Liechtenstein Customs Union with Switzerland, by Contina LTD Mauren, System Curt Herzstark,   Inside of case has both foam pads to protect the device. Also included is an original paperwork.

Fine . . . . . $1250.00       SOLD!!

Serial # 77040 Type 1 Curta Calculator This Curta is in very nice overall condition. All sliders go up and down smoothly. It will zero out. The add / Subtract lever moves easily.The black finish is near perfect and shows minimal wear. The serial # is 77040  dating it near the end of commercial production in the early 70's. On the bottom of the calculator it says Made in Liechtenstein, by Contina AG Mauren, No 77040.  The outer plastic case is nice with original pads and its dimensions are approximately 4 5/8" tall by 2 1/4" diameter.It also has the seldom seen outer leather case which is typically associated with use in the field.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line calculator in its day and was immensely popular before the advent of the handheld electronic calculator in the 70's essentially made them obsolete. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. In todays world they are also used in road rallies and other similar applications. A highly collectible piece of calculation history.

Fine . . . . . $950.00      SOLD!!

Type 2 Curta Calculator w/ Leather Outer Case   The serial # on this two tone Type II Curta is 550769. That would date it from the mid 1950's  a few years after the Type 2 Curta was introduced. The bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren. The Curta calculator was first developed or conceived / invented by Carl Herzstark while imprisoned in a German concentration camp during World War II.

This 2 tone Curta comes with 2 pieces of original paperwork. The condition of it, the black plastic case, the outer leather case, and the paperwork are all excellent. It operates smoothly and as it should. It adds, carries, zeroes out, the sliders are free and smooth, etc.The subtraction lever works. A very nice early Curta in its original plastic case that will make for a good user for car rallies or other applications. Curta Calculators are a must have for any collection concerned with the history of Calculation and how it has progressed.They were the last  and best mechanical calculator made before the advent of electronic handhelds relegated them to collectible status.   A classic!!

Good +  . . . . . $1250.00         SOLD!!

Early # 13090 Curta Type 1 Calculator It is in very nice cosmetic condition but does have jamming issues. All sliders go up and down smoothly. It will zero out. The add / Subtract lever moves.It does hang up / jam when asking it to do repeated calcs. It will loosen up with gentle movements to allow it to be zeroed out. It is being sold as is, and in need of repair, or servicing.

The black finish is near perfect and shows minimal wear on the bottom or elsewhere. The serial # is 13090 dating this from approx. 1951 just a few years after commercial production began. On the bottom of the calculator it says Made in Liechtenstein, by Contina AG Mauren, No 13090. The side has a distributer / owner stamp from South Africa. It says Suttner's, Sole Agent in Johannesburg SA. Other examples with this marking have been found. The outer metal case is nice and its dimensions are approximately 4 5/8" tall by 2 1/4" diameter.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line calculator in its day and was immensely popular before the advent of the handheld electronic calculator in the 70's essentially made them obsolete. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. In todays world they are also used in road rallies and other similar applications. A highly collectible piece of calculation history.

Fair . . . . . $450.00    SOLD!!

Type 1 Curta Calculator Metal Case   The serial # on this Type I Curta is 21403. The bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren. The Curta calculator was first developed or conceived / invented by Curt Herzstark while imprisoned in a German concentration camp during World War II.

The cosmetic condition is great, but it is inoperable and jammed up. The slides go up and down, but the top collar at times will not raise, and it will not crank properly. It was forced at some point as the anti reverse feature is not always in place. In other words it will crank a bit in reverse which it should never do. My experience says that means the pins at the top are damaged and bent. I did not go inside to confirm that on this one, but that was what the situation with the last one I had that operated like this one. It is being sold as is and in need of attention.

Fair  . . . . . $350.00    SOLD!!

Type 2 Curta Calculator   The serial # on this early  Type II Curta is 539904. That would date it from the mid 1950's  a few years after the Type 2 Curta was introduced. The bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren. The Curta calculator was first developed or conceived / invented by Carl Herzstark while imprisoned in a German concentration camp during World War II.

This 2 tone Curta comes with 2 pieces of original paperwork. The condition of it, the case, and the paper are all excellent. It operates smoothly and as it should.. It adds, carries, zeroes out, the sliders are free and smooth, etc.  A very nice early Curta in its original plastic case that will make for a good user for car rallies or other applications. Curta Calculators are a must have for any collection concerned with the history of Calculation and how it has progressed.  A classic!!

Good +  . . . . . $995.00     SOLD!!

Type 1 Curta Calculator w/ Leather Covered Case   The serial # on this early Type 1 Curta is 31687. That would date this from the mid 1950's,  a few years after production began. I also see that the serial # is a prime number for what that is worth.

On the bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren, No 31687. Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. The inside of the case has both foam pads to protect the device The outer metal case is  covered in tightly sewn leather. I have seen these in separate leather cases for field work, but have never seen one like this with the original case covered in sewn leather.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line calculator in its day and was immensely popular before the advent of the handheld electronic calculator essentially made them obsolete in the 70's. The last ones were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. Today they are highly collectible pieces of calculation history, and are an important example of calculation technology in the scheme of things. In todays world they are also used in road rallies and other applications.

This example is in excellent condition and operates flawlessly. The body is very nice and shows no wear or tear. There are  minor scuffs and losses in the leather cover on the outer metal case. The provenance I can offer is that this example came from Mexico.

Good +  . . . . . $695.00        SOLD!!

Type 2 Curta Calculator w/ Case  The serial # on this Type 2 Curta is 508586. That would date this from the mid 50's. The last examples were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. The Type 2 Curta was introduced shortly after the Type 1, and is basically the same design machine w/ a larger capacity.

This Curta Calculator has issues and is being sold as is. It jams up, and the crank works sometimes, sometimes not.  The body is very nice and shows minimal wear or tear. The outer case is metal and has minor scuffs.  The bottom of the calculator is stamped Made in Liechtenstein, by Contina AG Mauren, System Curt Herzstark along with the serial number.

The CurCurt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's and collectible shortly afterward. They are highly collectible pieces of calculation history, and an important example of how calculation technology has advanced.

FAIR / TBR  . . . . . $295.00      SOLD!!

Curta Type 2 Calculator  This interesting design and very collectible calculator is in super condition. This Curta calculator is a type 2 serial number 549881. These devices were first invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is the manufacturer info, and it says  Made in Liechtenstein, (Customs Union with Switzerland.) by Contina LTD. Mauren System Curt Herzstark. There is a Lietz sticker on the side, and this indicates that they were the distributor of this example. The black plastic case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. Inside of the black plastic case has both foam pads to protect the device. This one also includes the rare and unusual leather carry case for field work. It is in excellent condition, and has seen little use. The type two has a larger capacity than the type1 and has 11 columns that carry out to 15 places. The operation is flawless. These were the tool of choice just before the introduction of the electronic handhelds came onto the market. The end of an era!!

Good . . . . . $1250.00        SOLD

Curta Type 2 Calculator  This Curta calculator is in super condition. The lietz tag is from the distributer. The condition is like new.

Good + . . . . . $950.00       SOLD

Type 2 Curta Calculator   The serial # on this early Type II Curta is 505262. That would date it from  late 1954, the second year the Type 2 Curta was offered. The bottom of the calculator says Made in Liechtenstein, by Contina AG Mauren. The Curta calculator was first developed or conceived / invented by Curt Herzstark while imprisoned in a German concentration camp during World War II.

This Curta operates as it should. It adds, carries, zeroes out, the sliders are free and smooth, etc. There is one small nick in the aluminum case bottom as I have shown. A nice early Curta in its original metal case that will make for a good user for car rallies or other applications. Curta Calculators are a must have for any collection concerned with the history of calculation and how it has progressed.  A classic!!

Good +  . . . . . $795.00          SOLD!!

Curta Type 1 Calculator  This interesting design calculator is in super condition, and operates flawlessly. This rare Curta calculator type 1, serial number 47288. was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says "System Curt Herzstark, Made in Liechtenstein, by Contina AG Mauren, Type 1 No 47288.  Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. Inside of case has both foam pads to protect the device. Also included are a copy of  an instruction sheet that was provided with it.

Good . . . . $995.00        SOLD

Curta Type 1 Calculator (FIRST MODEL)  This is a very early and very rare  first model Type 1 Curta calculator. The serial number is 5714.   That would date this within the first couple of years of manufacture back in the late 40's.This unusual calculator is in excellent condition, fully operational,  and shows little sign of either use or abuse, just a few storage dings on the outer case. 

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren,  No 5714.  Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. The inside of the case has both foam pads to protect the device although the upper foam button has deteriorated a bit.

This interesting design calculator was the top of the line and immensely popular before the advent of the handheld electronic calculator essentially made them obsolete in the 70's.The last ones were made up until about 1970 and all told about 150,00 both Type #1 & Type #2 models were made. Today they are highly collectible pieces, and are an important example of calculation technology in the scheme of things.

This example is in excellent condition and operates flawlessly. The body is very nice and shows no wear or tear and there are just a few minor scuffs on the outer metal case. Note the design of the column levers and how they are different from later examples.  The provenance I can offer is that this example came from Brazil and a college professor there was given it by a architect / engineer  back in the 50's and it has sat in a drawer since then.

Excellent  . . . . . $1495.00       SOLD!

Curta Type 2 Calculator   This is a very nice Type 2 Curta calculator. The serial number 536760. It is a later model and has the two tone color scheme on the body. The main difference between a Type 1 & 2 are the number of places it has. They were both being offered simultaneously although the Type 1 was introduced first a few years before the Type 2 came to market. 

Cosmetically this Curta is as nice as one could hope for. It functions smoothly and flawlessly. The black plastic case with its rubber bumpers is in great condition as well. The original fold out instruction sheet and manual show some use, but are nice as well.

This Curta calculator is one of the most interesting designs of manual calculators ever designed or offered. Before the advent of hand held electronic calculators they were cutting edge technology and the final word in mechanical calculators. It is pretty incredible that they were able to get all that capability to fit into the palm of a users hand. The introduction of the hand held electronic calculator  though ended it reign as the calculator of choice for use, and began it accent into the realm of one of the most sought after of collectible calculating devices. These vintage calculators are very collectible now, and are getting harder and harder to find.

These devices were first invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. On the bottom of the calculator is the manufacturer info, and it says  Made in Liechtenstein, (Customs Union with Switzerland.) by Contina LTD. Mauren System Curt Herzstark. The black plastic case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. Inside of the black plastic case has both foam pads to protect the device.  The type two Curta has a larger capacity than the type1 and has 11 columns that carry out to 15 places.  The end of an era!!

Excellent  . . . . . $1095.00       SOLD!

Curta Calculator Type II No. 543729 The serial # on this Type II Curta is 543729. This Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body is very nice and shows minimal wear or tear. The plastic case is nice.

The Curta calculator was invented or developed by Carl Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

In todays world they are at times used in road rallies and some other applications but are worth more as collectibles and examples of calculation history. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history today, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1750.00      SOLD!!

Type 2 Curta Calculator   The serial # of this late model two-tone Type II Curta is 528335. That would date it from the early 1960's. The Curta calculator was the top of the line calculator in its day and was immensely popular before the handheld electronic calculator essentially made them obsolete in the 70's. The last Curta Calculators were made about 1970 and all told about 150,00 Type #1 & Type #2 models were made. On the bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren. The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II.

This example is in good cosmetic condition but operation is spotty. It will zero out but at least one of the number slides is stuck, and the operation is erratic seemingly working at times, and then jamming up and become hard to operate before settling into a position where it can be zeroed again. I am not sure if this means it needs to be repaired, or just cleaned and adjusted. There is no case. 

Good  - . . . . .$395.00        SOLD!!

Type 1 Curta Calculator   The serial # on this early Type I Curta is 21483. That would date this from the 1953 just a few years after Curta calculators were first introduced to the market. The bottom of the calculator is marked Made in Liechtenstein, by Contina AG Mauren. The Curta calculator was first developed / conceived / invented by Curt Herzstark while imprisoned in a German concentration camp during World War II.  They were put into production shortly after the WWII ended.

This example is in super cosmetic condition, but does not operate properly and is jammed up. In addition to the top ring not wanting to revolve, some of the number slide controls are stuck  It must have happened early on and the owner simply put it back as it is still in its original metal case and original cardboard box with 3 pieces of original paperwork. The condition seems nice enough that this example would warrant the cost of a repair /  inspection by one of the Curta repair places that can be found on the internet.  

Good -  . . . . .$500.00       SOLD!!

Type 1 Curta Calculator w/ Metal Case & Original Paper   The serial # on this early Type1 Curta is 15087. That would date this from the early 1950's according to the latest dating chart available online. That would be just a few years after production began in 1947.

On the bottom of the calculator is says Made in Liechtenstein, by Contina AG Mauren, No 15087. Case dimensions are approximately 4 5/8" tall by 2 1/4" diameter. The inside of the case has both foam pads to protect the device when stored. The outer metal case is in fine condition.

This example is in excellent operating and cosmetic condition. It operates flawlessly. The body is very nice and shows no wear or tear. It comes with the original paper work shown, and it is stamped with the same serial number. Very Nice!!

Good +  . . . . .$995.00         SOLD!

Type II Curta Calculator 549950 This Curta with its original shipping box and paperwork in a plastic case is in fine condition. The serial No. is 549950. This Type II Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body shows little if any wear or tear. The plastic case is very nice with little to no scuffs either. The outer cardboard shipping box has some bug damage where the insects found the white lettering to be tasty. They did not make it inside, or get to the included paperwork.

The Curta calculator was invented by Curt Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line hand held manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history, and an important example of calculation technology in the scheme of things.

Fine. . . . . $2100.00         SOLD!!

Curta Calculator Type II No. 557878  The serial # on this Type II Curta is 557878. This Type II Curta Calculator is in excellent condition and operates smoothly and flawlessly. The body is very nice and shows minimal wear or tear. There are minor scuffs on the sole. The plastic case is nice.

The Curta calculator was invented or developed by Carl Herzstark while imprisoned in a German concentration camp during World War II. This interesting design calculator was the top of the line manual calculator in its day and was immensely popular before the advent of the handheld electronic calculator which essentially made them obsolete in the 70's.

In todays world they are at times used in road rallies and some other applications but are worth more as collectibles and examples of calculation history. They were made up until about 1970 and all told about 150,00 both Type 1 & Type 2 models were made. They are highly collectible pieces of calculation history today, and an important example of calculation technology in the scheme of things.

Fine . . . . . $1750.00          SOLD!!

Keuffel & Esser
No. 4012 Thacher Calculator

This.

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator in Box w/ Manual This #4012 Thatcher calculator / slide rule is in nice overall condition. The serial # is 4121 and this # can be found on the mounting board near the top back edge and on the plaque inside the top lid.

The inner scales on the drum are white and very nice. The scales on the outer frame Have some chips and browning. Nothing real serious. The instructions on the base are nice as can be seen in the pics, The box is nice noting a few scratches and some loses to the finish.

The Thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The idea was an immediate success with the scientific and engineering communities. K & E bought they rights to sell and manufacture the popular rule. Stanley initially produced them in England for K & E. and production was moved to the states near the turn of the century. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators catalog # to 4012 or 4013. The 4013 being the upgraded model w/ a built in magnifier. There were approx. 7000 total units made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A nice piece that will display well and be a great addition to the old office or calculation related collection!! Enjoy.

Good . . . . . $650.00       SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thatcher calculator / slide rule is in super nice condition and will display nicely. The serial # is 3681 and this # can be found on the mahogany mounting board near the top back edge.

The inner scales on the drum are very nice with a nice even patina. They are still a nice bright white as are the scales on the outer frame. They have hardly yellowed at all and there is no lifting or spotting to be seen.  As can be seen in the pics, the instructions on the base are very nice. The mahogany box has a few minor scratches and paint splatters. The top has a repaired crack but is now OK.  There are no names, initials, or other carved into the box, base, or calculator.

The Thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The idea was an immediate success with the scientific and engineering communities. K & E bought they rights to sell and manufacture the popular rule. Stanley initially produced them in England for K & E. and production was moved to the states near the turn of the century. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013. The 4013 being the upgraded model w/ a built in magnifier. There were approx. 7000 total units made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A nice piece that will display well and be a great addition to the old office or calculation related collection!!  Enjoy.

Fine . . . . . $1095.00     SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator (Last Model) This #4012 Thatcher calculator / slide rule is in super nice condition. The serial # is 6285 and this # can be found on the original OAK mounting board near the top back edge. Near the end of production K & E stopped using the typical mahogany mounting board and outer box and began using oak for the last few hundred before ending production.; This 4012 oak box & base variant is much harder to find than the earlier mahogany versions. In addition to the K & E serial number there is also a brass plaque on the base board indicating it was property of the US Navy at one time.

The inner scales on the drum are white and very nice. The scales on the outer frame are near perfect as well. They have hardly yellowed at all and there is no lifting of the paper scales or spotting to be seen. The instructions on the base are very nice as can be seen in the pics. The oak box is nice noting a few scratches and some loses to the finish. There are no names, initials, or other carved into the box, base, or calculator.

The Thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The idea was an immediate success with the scientific and engineering communities. K & E bought they rights to sell and manufacture the popular rule. Stanley initially produced them in England for K & E. and production was moved to the states near the turn of the century. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators catalog # to 4012 or 4013. The 4013 being the upgraded model w/ a built in magnifier. There were approx. 7000 total units made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A nice piece that will display well and be a great addition to the old office or calculation related collection!!  Enjoy.

Fine . . . . . $1295.00         SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thatcher calculator / slide rule has developed a nice even patina. There is some minor spotting, but no looseness or peeling of the scales. The 1593 serial # can be found on the mounting board near the top back edge.

The inner scales on the drum are very nice. The scales on the outer frame are pretty good. The instructions on the base are nice. There is no box. There are no names or initials carved into the base, or calculator. There is a series of numbers on the bottom left that seem like a social security #.

The Thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The idea was an immediate success with the scientific and engineering communities. K & E bought they rights to sell and manufacture the popular rule. Stanley initially produced them in England for K & E. and production was moved to the states near the turn of the century. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators catalog # to 4012 or 4013. The 4013 being the upgraded model w/ a built in magnifier. There were approx. 7000 total units made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A nice piece that will display well and be a great addition to the old office or calculation related collection!! Enjoy.

Good + . . . . . $495.00        SOLD!!

K & E / Keuffel & Esser 4013 Thacher Slide Rule / Calculator This #4013 Thatcher calculator / slide rule is very nice. The serial # is 4071 and this # can be found on both the mahogany mounting board near the top back edge along with the eagle logo and K & E name and on the label inside the top lid. The K & E 4013 calculator / slide rule is the upgraded and rarer model of this style calculator / circular drum slide rule that came equipped with an auxiliary magnifier to help the user read the scales.

The overall condition of both the 4013 rule and the box are very nice. The scales on the inner drum are nice with a few minor rubs and have a nice even patina. The outer scales are great and have been pictured. There is little or no spotting and rust except at the very ends of the scales. The instructions on the base are good. The triangular bar or rod for the magnifier and the bracket are original. The magnifier itself is a replacement that is very close in appearance to an original from this time period.  The mahogany box is very nice with just a few minor scratches. There are no names, initials, or other carved into the box, base, or calculator.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them. Stanley initially produced them in England. K & E moved production to the states near the turn of the century.The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013. I believe this Thacher dates from shortly after the turn of the century  There were approx. 7000 total made with very few being the upgraded 4013 w/ magnifier like this. They are far rarer than the 4012.   The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A super piece that will display well and be a great addition to the collection!!  Enjoy.

Fine . . . . . $1750.00    SOLD!!

K & E / Keuffel & Esser # 1740 (4012) Type I  Thacher Slide Rule / Calculator  This Type I Keuffel & Esser / Thacher  # 1740 calculator / slide rule is a very early and one of the finest condition Thatcher calculators I have ever had the pleasure to offer. The serial # is 466.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long. if laid out in a line. The idea was an immediate success with the scientific and engineering communities.  K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century.

The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. 3 years later in 1890 they dropped the N in catalog listings. In 1899 they changed the calculators # to 4012.The only place this example is marked is a small tag on the base with the serial #. The board is not marked, nor is the original box and there is no indication it ever was.  The model number is not called off, and given how early this example is the proper call out might be 1740-N.

The overall condition of this unusual slide rule is exceptional. There is virtually no spotting or yellowing except at the very end as one would expect and is the norm. The inner scales on the drum are very nice, a mellow white, with no damage or lifting of the paper scales. Note from the end shot the condition of the felt pads on the insides of the drum. They are like new!!  The instructions on the base are as nice as one could ask for. The mahogany box is very nice with most of its original finish and just a few minor scratches. There are no owner names or initials carved into the box, base, or calculator. I can not over state the condition of this rule. It is about as nicet as you can get or will ever see.

The inventors name is really Thacher, but it was misspelled Thatcher on almost all versions of this calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad.

A super piece that will display well and be a great addition to the collection!!  Enjoy.

Fine. . . . . $1795.00        SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thatcher calculator / slide rule is in good condition and will display nicely. The serial # is 5074 and this # can be found on both the mahogany mounting board near the top back edge along with the eagle logo and K & E name, and on the paper label inside the top lid.

The inner scales on the drum are nice with a few minor rubs and have a nice even patina. There has been some lifting of the outer scales. Some of the loose areas were taped at some earlier point and that discolored a few areas. The worst areas have been pictured. (see pics)   There is little spotting or rust coming through, it is just that the scales lifted.As can be seen in the pics, the instructions on the base are very nice.  The mahogany box is very nice with just a few minor scratches and paint splatters. There are no names, initials, or other carved into the box, base, or calculator.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them. Stanley initially produced them in England  for K & E. K & E moved production to the states near the turn of the century.The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013.There were approx. 7000 total made   The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A nice piece that will display well and be a great addition to the collection!!  Enjoy.

Good . . . . . $700.00    SOLD!!

K & E / Keuffel & Esser 4012 Thacher / Thatcher Slide Rule / Calculator This #4012 Thatcher calculator / slide rule is in very nice overall condition. The serial # is 4133 and this # can be found on both the mahogany board the calculator is mounted on near the top back edge, along with the eagle logo and K & E name, and on the label inside the top lid. Laid out its scales would measure over 30' long. It was the calculator of choice in its day and is an important part of calculator history.

The scales on the inner drum have a nice even patina. There is one small area with light stains.  The outer scales are nice as well. There is little or no spotting and rust.The instructions on the base have some losses. The original instruction manual is present and in fine condition. These rules are almost never found with the original instruction manual.  The mahogany box is very nice with just a few minor scratches. There are no names, initials, or other carved into the box, base, or calculator.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them. Stanley initially produced them in England. K & E moved production to the states near the turn of the century.The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013. I believe this Thacher dates from the teens as that is what the manual is dated. There were approx. 7000 total made.The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A super piece that will display well and be a great addition to the collection!!  Enjoy.

Good + . . . . . $675.00       SOLD!!

# 4012 Thatcher Calculator by Keuffel & Esser  The Thatcher calculator is one of the best known and most sought after of all calculating devices that was ever produced or offered. First introduced in England in the 1880's it was developed and designed by a fellow named Edwin Thacher, ( Keuffel & Esser did him the disservice of misspelling his name on subsequent calculators they offered by adding a T making for Thatcher appearing on the calculators). First patented in the US in 1881,  production and manufacture was originally carried out in England but was moved to the US shortly after K & E bought out the rights to manufacture the rule. There were two basic models available the 4012 and the 4013  which was basically the same rule with the addition of a magnifier which ran on a bar in front of the scales.

The condition of this early example is stunning. The paper scales which are often damaged, or yellowed and peeling or flaking from rust under them are near flawless in this example. The previous owner has circled a few numbers in ink on the internal scales to facilitate a repeated calculation he must have been making, but this is minor and insignificant to the overall importance of this rule. The instructions are complete and legible as well.

Good . . . . . $1250.00       SOLD

The New York Automatic Lightning Calculator /Automatic Arithmeticer by John Schmidt & Co.
AKA K&E / Keuffel & Esser #1704 / Thatcher Patent Slide Rule / Calculator Serial # 704   This is a very rare calculator / slide rule and before this one turned up was an unheard of and never before seen variation of a Type 1 Keuffel & Esser Thacher Patent Slide Rule / Calculator.

Numerous Google searches turned up no reference to John Schmidt & Co or any reference to The New York Automatic Lightning Calculator this slide rule is referred to as on the label in the top of the box. Searches for the second name "Automatic Arithmeticer" as the applied labels on the end of the drum refer to it as, produced nothing either.   I found no reference to Thacher Patent calculators / slide rules ever being offered by anyone other than K & E.  This is a true oddity, and rarity in the slide rule collecting field.

Edwin Thatcher first patented his idea for this design slide rule in England in 1881. The design and idea were an immediate success with the scientific and engineering communities there and abroad. K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century. From research I did on the internet Thacher Calculators are "typed" into three periods. Type 1 Thacher slide rules were produced from 1881 to 1899 and had certain characteristics that  differentiated them from the later to come models. This ones features match those of an early Type 1 instrument. The serial # on this instruments box is 704.  Most early Type 1 Thacher calculators were marked with the serial number on a small plaque attached to the front right corner. That plaque would also give the name Keuffel & Esser, and the serial #. That plaque is missing on this instrument, but the nail holes are there.

It appears that this slide rule began life as a Thacher calculator and that it has been modified. There is a large label attached to the box lid that claims there is a patent pending. It also has a Masonic symbol, and a bunch of text attesting to what a wonderful calculating device it is. It has also been modified with the addition of paper labels attached to the ends of the inner drum. Those labels give it different name not on the label in the lid. The label also claims John Schmidt was the manufacturer and that a patent was pending.

There is little to no doubt this was / is a Keuffel & Esser Thacher before it was modified. You can see where the Thacher name was taken off of the instructions on the left side above the word Calculating Instrument. A bit unceremoniously being just scraped off.. On the right front, where the small K & E tag with serial # would be there are just 2 empty holes for the small nails. The other place that Thatcher rules were identified, was on the end of the inner drum, and they have been covered with new different paper labels with new information and names hiding the original K & E And Thatcher info typically found there.

The overall condition of the rule itself is good with no major chips or damage to the scales to speak of. There are small patches of brown spots on the outer scales as is typically found, but it is not bad.. The inner paper scales have some bubbles or minor lifting in them, but overall are nice, and stable.   Most of the scales are a light mellow tan / yellow that is normal. The instructions on the base are in very nice condition. The mahogany box is OK noting the crack along the bottom, and one in the back right corner. There are no names carved into the box or base of the calculator itself..

Many questions remain. Who? When? Why? Others / More? and more. A series mysteries waiting to be solved through further research.  But bottom line, a  nice example of a rare and interesting calculating slide rule that no one else has.Opportunity knocks but once.

Good +. . . . . $2450.00       SOLD!!

K & E / Keuffel & Esser Thatcher #4012 Slide Rule / Calculator  This is a nice but well used Thatcher's calculator / slide rule. The famous Thacher calculator with its near unique sliding drum design has scales totaling over 30' long. if laid out in a line   The inventors name is really Thacher, but it was mis-spelled on almost all versions that K & E offered, hence the use of two different spellings here.

Thatcher slide rules were first patented in England in 1881 and were an immediate success with the scientific and engineering communities. K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century.

The serial # on this instrument is 4252 and the box and instrument have the same number .  The overall condition of the rule itself is good with no chips or damage to the scales to speak of. There are just a few small patches of brown spots, most no larger than pin heads on the outer scales. Most of the scales  are a light mellow tan / yellow that is normal. The inner scales on the drum are very nice as well with no damage or lifting. The instructions on the base are worn but present. The mahogany box is OK noting the crack along the bottom front edge. It has its original finish. There are no names carved into the box or base of the calculator itself..

A nice example of this rare and interesting calculating slide rule priced to sell.

Good . . . . . $795.00       SOLD!!

Keuffel & Esser Thatcher #4012 Slide Rule Calculator in #4013 Box   The king of calculators / slide rules. The Thatcher was first patented in England in 1881. K & E bought the rights and at first had them produced by Stanley of England before moving the production here to the states near the turn of the century. The serial # on the instrument is 4250. The box which is actually marked for the upscale model #4013, is slightly larger to accommodate the rod and magnifier that came with that model. It is nice noting the one tight age crack across the top  The serial # on it is #2967. It seems that at some point in its life this one was put back into the wrong box. The overall condition of the rule itself is exceptional. The scales are a light mellow tan, but there is virtually no rust spots or damage to the scales as is often found on these instruments. There are a couple of minor chips near the edges, and  I see one small tear in the scale on one peak, but that is about it. The inner scales on the drum are very nice. The instructions on the base are very nice as well. The base is nice and unlike the last one of these I owned the entire student body did not carve their name into the bottom of this one. All in all one of the nicest examples of the rare and interesting calculation device I have ever had the pleasure to see.

Good . . . . . $1450.00        SOLD

K & E / Keuffel & Esser Thatcher #4012 Slide Rule / Calculator     This is a very nice and very early Thatcher's calculator.  Thatcher calculators / slide rules were first patented in England in 1881 and were an immediate success with the scientific and engineering communities. The Thacher calculator with its near unique sliding drum design has scales totaling over 30' long. The name is really Thacher, but it was mis-spelled Thatcher on almost all versions. Hence the use of two different spellings. K & E bought the rights to produce them, and initially Stanley of England produced them in England. K & E moved production to the states near the turn of the century.

The serial # on this instrument is 1444 making it a relatively early model. The Thatcher was in production from the late 1800's up till about the mid 20th century. I believe  there were less 8,000 or so made over the years.

Good . . . . . $1250.00        SOLD

K & E 4012 Thatchers   The overall condition of the rule itself is very nice with no major chips or damage to the scales. The scales are a light mellow tan / yellow, and there is virtually no rust spotting , browning, or damage to them.  The inner scales on the drum are very nice as well with no damage or lifting. The instructions on the base are very nice. The mahogany box  has its original finish. There are no names carved into the box or base of the calculator itself.

Another very nice example of this rare and interesting calculating slide rule.   Highly recommended!!

Good . . . . . $975.00      SOLD

K & E / Keuffel & Esser Thatcher #4012 Slide Rule / Calculator  This is a nice early Thatcher's / Keuffel & Esser #4012 calculator / slide rule.The serial # is 2659. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long. if laid out in a line   The inventors name is really Thacher, but it was mis-spelled on almost all versions of this calculator that K & E offered, hence the use of two different spellings here.

Thatcher slide rules were first patented in England in 1881 and were an immediate success with the scientific and engineering communities. K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century. This is an earlier version. Note that the label in the box lid calls this off as a #1740. That was K & E's catalog designation for this rule in the early days. 

The overall condition of the rule itself is very good with just a few chips at the peaks of the outer scales. There is very little spotting. There are just a few small patches of brown spots, most no larger than pin heads on the outer scales. Most of the scales are a light mellow tan / yellow that is normal. The inner scales on the drum are very nice as well with no damage or lifting of the paper scales. The instructions on the base are as nice as one could ask for. The mahogany box is nice and has most of its original finish. The label inside is near perfect. There are no names carved into the box or base of the calculator itself..

A nice example of this rare and interesting calculating slide rule priced to sell.

Good . . . . . $1250.00       SOLD!!

K & E / Keuffel & Esser # 1740 (4012) Type I  Thacher Slide Rule / Calculator  This Type I  Keuffel & Esser / Thacher  # 1740 calculator / slide rule is the earliest and finest condition Thatcher calculator I have ever had the pleasure to offer. The serial # is 633. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012. Note how the label in the box lid calls this off as a #1740 / 633. That was K & E's catalog designation for this rule after 1890 and I would assume means this dates from within a year or so of that date.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long. if laid out in a line. The idea was an immediate success with the scientific and engineering communities.  K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century.

The overall condition of the rule is exceptional. There is virtually no spotting or yellowing. The inner scales on the drum are very nice as well with no damage or lifting of the paper scales. Note from the end shot the condition of the felt pads on the insides of the drum. They are like new!!  The instructions on the base are as nice as one could ask for. The mahogany box is very nice and has most of its original finish. The label with serial # and model number inside is near perfect. It also has an inspectors tag in the lower corner. There are no names initials or other carved into the box, base, or calculator. I can not over state the condition of this rule. It is as close to mint as you can get or will ever see.

The inventors name is really Thacher, but it was misspelled Thatcher on almost all versions of this calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad 

Excellent . . . . . $1750.00       SOLD!!

K & E / Keuffel & Esser 4013 Thacher Slide Rule / Calculator  The 4013 Thatcher is the same as a 4012 with the addition of a magnifier. Some staining but not bad. This example has a replaced magnifier, but the rail and brackets are original.

The inventors name is really Thacher, but it was misspelled Thatcher on almost all versions of this calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad 

Excellent . . . . . $1675.00        SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thacher calculator / slide rule is very nice. The serial # is 1963 and this can be found on the mahogany mounting board near the top.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them, and initially Stanley of England produced them in England before K & E moved production to the states near the turn of the century.The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013. There were approx 7000 total made with the vast majority being the 4012 model.

The overall condition of the rule is very nice. The scales have an even patina which is typical  There is little or no rusting, spotting or lifting of the scales. There are no major stains or rust spots coming up through the scales. There are a couple of minor stains on the inner drum. The scales are very nice with no damage or lifting of the paper scales. The instructions on the base are as nice as one could ask for.The mahogany box is very nice and has most of its original finish with just minor scuffs. There are no names, initials, or other carved into the box, base, or calculator. All in all as nice an example as you are likely to find.

The inventors name of this slide rule is Thacher, but it was misspelled Thatcher on almost all versions of this calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad 

Good + . . . . . $975.00       SOLD!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thacher calculator / slide rule is very nice. The serial # is 1678 and this can be found on the mahogany mounting board near the top along with the eagle logo and K & E name. The scales on the inner drum look great and have a nice even patina. I see no stray marks or other issues. There is literally or no rusting, spotting, or lifting of the scales on the outer scales. The instructions on the base are as nice as one could ask for. Check all the pics to see just how nice this rule is.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them, and initially Stanley of England produced them in England. K & E moved production to the states near the turn of the century.The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013. I believe this dates from right around that time period. There were approx 7000 total made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of this calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

The mahogany box is OK with areas of finish loss as can be seen. There are no names, initials, or other carved into the box, base, or calculator. The box has a lock installed which is a feature I have not seen before. There is a key, but the lock needs to be fiddled with as it does not seem to want to turn right now. A super piece that will display well and be a great addition to the collection!!  Enjoy.

Good + . . . . . $1250.00       SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thacher calculator / slide rule is very nice. It has developed a nice even yellowing of the scales w/ little to no lifting or spotting. The original instructions are included.   Check all the pics to see just how nice this rule is.

Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The Thacher calculator has a  near unique sliding drum design whose scales total over 30' long if laid out in a line. The idea was an immediate success with the scientific and engineering communities. K & E bought the rights to produce them, and initially Stanley of England produced them in England. K & E moved production to the states near the turn of the century.The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators # to 4012 or 4013. I believe this dates from right around that time period. There were approx 7000 total made. The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of this calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

The mahogany box is OK with areas of finish loss as can be seen. There are no names, initials, or other carved into the box, base, or calculator. A super piece that will display well and be a great addition to the collection!!  Enjoy.

Good + . . . . . $675.00       SOLD!!

K & E / Keuffel & Esser 4012 Thacher Slide Rule / Calculator This #4012 Thatcher calculator / slide rule has developed a nice even patina. There is little if any spotting, looseness, or peeling of the scales, just a nice even and pleasing yellowing. The relatively early 1318 serial # can be found on the mounting board near the top back edge.

The inner scales on the drum are very nice. The scales on the outer frame are pretty good. The instructions on the base are nice. The box is nice. There are no names or initials carved into the base, or calculator. All in all a pretty nice example.

The Thacher calculator has a near unique sliding drum design whose scales total over 30' long if laid out in a line. Edwin Thacher first patented the idea for this slide rule / calculator in 1881 in England. The idea was an immediate success with the scientific and engineering communities. K & E bought they rights to sell and manufacture the popular rule.

Stanley initially produced them in England for K & E. and production was moved to the states near the turn of the century. The Thatcher calculator was first offered by K & E in their 1887 catalog as the 1740-N. In 1890 they dropped the N. In 1899 they changed the calculators catalog # to 4012 or 4013. The 4013 being the upgraded model w/ a built in magnifier. There were approx. 7000 total units made.

The inventors name is Thacher, but it was misspelled Thatcher on almost all versions of the calculator that K & E offered, hence the use of two different spellings of Thatcher / Thacher in this ad and on the rule itself.

A nice piece of calculation history that will display well and be a great addition to the old office or calculation related collection!! Enjoy.

Good + . . . . . $1100.00        SOLD!!

Thacher Calculator Instrument 1917 Instruction Manual / Booklet All original, not a reprint. From 1917. Fragile w/ cover split on first page / cover. Nice!!

Good + . . . . . . $150.00     SOLD!!

Keuffel & Esser 4012 / 4013 Thacher Calculator / Circular Slide Rule C. 1914 Original Instruction Booklet / Manual These are almost always missing as they do not fit well in the box Thatcher calculators came in and so oftentimes got separated. Minor stains and some looseness to the binding, but overall very nice.

Good + . . . . . $150.00        SOLD!!

Keuffel & Esser
Stadia Rules

This.

K & E / Keuffel & Esser 4100 Stadia Rule   NOS Like new in green leather case and the original outer box.   Very Nice!!

        

Fine . . . . . $125.00     SOLD!!

K & E / Keuffel & Esser 4101 20" Stadia Rule   K & E offered these Stadia rules aimed specifically for use by surveyors and engineers in two sizes, a 10" model and this the much harder to find 20" version. The cursor is a bit dirty, but solid. I think the few dirty spots on the rule will clean. Overall very nice. A hard slide rule to find.

Fine . . . . . . . $125.00         SOLD!!

K & E / Keuffel & Esser Co # 4110 Power Trig Slide Rule  The condition of this unusual and rare K & E Sliderule is very nice. There is no damage to the rule or cursor. The previous owner did mark his name on the backside. The outer marked box has seen better days. I have read that these were a special order rule for the Navel Academy and that not many were produced.  Nice!!

Fine . . . . . $175.00      SOLD!!

Keuffel & Esser
Slide Rules

This.

Keuffel & Esser 4088-3 Slide Rule w/ Column Cursor & Leather Case    The condition of this K & E Sliderule is very nice. There is no damage to the rule, cursor, or orange leather case. It has the rare second model column cursor.

Fine . . . . . $100.00        SOLD!!

K & E / Keuffel & Esser 4053-5 Slide Rule w/ Magnifier This 20" No. 4053-5 slide rule is in great condition. It is housed in a near mint humped leather case made for the magnifier. It also has the outer green slip case and an instruction book. A nice piece of calculation history that will display well and be a great addition to the old office or calculation related collection!! Enjoy.

Good + . . . . . $125.00     SOLD!!

K & E / Keuffel & Esser 68-1608 Slide Rule The 68 1608 is a renamed 4053-5 and this example is from near the end of production. This nice looking sliderule in its original leather case and outer green box is complete w/ an instruction book. It looks to have seen little if any use. Condition / Condition / Condition.

Fine . . . . . $125.00   SOLD!!

K & E - Keuffel & Esser 4053-3 Polyphase 7' Classroom Teaching Aid Slide Rule  The condition of this 7' teaching aid sliderule is very nice. It is model 4053-3 Polyphase. It dates from the 1960's or 70's. I do not think it was ever used. It was missing the cursor and I made a new one for it. A perfectionist might not like it, but it is functional and looks pretty good. The finish is near perfect noting that there is a clear coat on it that is peeling in places, leaving the original paint below. Nice!!

Fine . . . . . $250.00       SOLD!!

K & E / Keuffel & Esser 4018 Pocket Slide Rule / Calculator  This is for the pocket watch style calculator / slide rule on the left in the picture. The Sperry patent on the right has sold. Keuffel & Esser / K & E offered this style pocket watch type slide rule / calculator back near the turn of the century and even though it is marked Pat Appl'd for is very similar in look, style, and design to the Sperry 4017 listed above. It is thought that K & E offered these to avoid the payment of royalties to Sperry for the 4017 they sold during the same time period.  It is in super nice condition and fully operational.  It is equally hard to find and not very many were made or survived. Opportunity!!

Fine . . . . . $695.00       SOLD!!

K & E / Keuffel & Esser 68-1215 Slide Rule   This is a very nice, and very hard to find rule by K & E. In its original box with case and instructions. It displays no signs of use. Very Unusual and very nice!!

Fine . . . . $150.00       SOLD!!

K & E / Keuffel & Esser 68-1130 Deci-Lon Slide Rule This 68-1130 Deci-Lon slide rule is NOS / Mint in its original display case / box. Deci-Lon slide rules were one of the last models K & E produced before the advent of electronic calculators made them all but irrelevant except to collectors.  The end of an era!!

Fine . . . . . $275.00     SOLD!!

K & E / Keuffel & Esser 68-1400 Analon Slide Rule This is a rare K & E rule. It is NOS and a very nice looking sliderule in its original leather case and outer green box. There is no label on the green box, but it is original. It looks to have seen little if any use. Condition / Condition / Condition.

Fine . . . . . $350.00       SOLD!!

#4061 T 5" Duplex Slide Rule w/ Trig Scales and Clamshell Cursor   This is a very rare sliderule that K & E only produced for a few short years back near the turn of the century. It has the second model cursor K & E produced or experimented with known as the clamshell model. Keuffel and Esser used this design for a very short period before offering the columned cursor and then the frameless cursor before they settled in to the typical design framed cursor that most rules are found with.

The condition of this example is super. There is no serial # and it has 2 patent dates from 1905 and 1908 on the bottom rail in red. The leather case is missing its flap and the previous owner did write his name on it, but this is not a detraction or problem as the overall condition and rarity of the rule itself are the important aspects here. Super!!!

Good . . . . . $975.00        SOLD

K & E / Keuffel & Esser <N4133> Roylance Electrical Slide Rule w/ Magnifier & Humped Case The Roylance 4133 is a hard to find slide rule developed specifically for electrical related calculations. It has special scales to help determine the load capacity for different lengths of different size wire.  K & E introduced this 8" rule in 1915. The serial # is 415938 and dates from the 1930's.

This is an unusual variant with a fitted magnifier and its original nice condition humped leather case to allow for that. The overall condition of the rule itself is nice.  There is some light tarnish on the magnifier brackets, and the plastic cursor bars have cracks in them but are stable. The 2 line cursor glass and the metal frame are OK.

Good . . . . . $45.00        SOLD

K & E / Keuffel & Esser 68-1100 Deci-lon Slide Rule This is a nice looking sliderule. The leather case is fine and one of the last style / models offered.

Fine . . . . . $125.00          SOLD!!

The #4105 Webb Stadia Rule  The Webb Stadia rule is a great design, and was meant for field use this explaining the relatively few that have survived. It is approx 1 1/2 dia. and the inner slide rule is protected by the outer tole painted and decorated hard cover. Keuffel & Esser's description in their catalog describes this design as being equal to a straight slide rule that was 4 1/2' long that has been compacted into a 1 1/2" cylinder that is only 15" long.  It is interesting to note that at the time it only cost .50 more than the hard to find, but much more common #4100 slide rule which was also used for Stadia or survey related work. It is a wealth of information when looking for obscure and old items that are not found in later catalogs.

The condition of this early example is stunning. The paper scales which are often damaged, or yellowed and peeling or flaking from rust under them are nice in this example, noting some rubs and wear. The instructions on the tube are complete and legible as well.. This is a rare and unusual opportunity to own one of these desirable calculators.

Good . . . . . $1450.00        SOLD

The Sperry Patent Pocket Calculator #4017 by Keuffel & Esser    There are many different watch style calculators available, but the Sperry which was offered by K & E is one of the hardest of all to find. The cost in 1913 was 15.00, a considerable sum in those days, and an amount that was sure to dissuade all but the most eager or serious. The write up and description in the early K & E catalogs for these calculators is great with a style and text that was sure to impress the prospective buyer who felt it was time to trade in the old slip-stick, but that $15.00 price tag must have been a major obstacle as few are available today.

Good . . . . . $795.00        SOLD

The Sperry Patent Pocket Calculator #4017 by Keuffel & Esser    K & E offered this, the Sperry, and the 4018 which they copied and offered after the Sperry patent ran out. It is a far harder to find calculator.

Good . . . . . $795.00         SOLD

Keuffel & Esser 4095 Merchants Slide Rule   This style rule has only 4 scales for the limited figuring required to run math calcs for a business. It is a frameless cursor era in the case and remains of the box.

Good . . . . . $75.00         SOLD

K & E 68-1749  (4096) 20" Desk Top Slide Rule w/ Hard Case  The 68-1749 desk top slide rule was offered for use in offices or most any desktop, and was equipped with feet to hold it on an angle in front of the user. Prior to 1962 it was numbered (4096). K & E also offered this rule without the hard case and cast iron feet. This variant in the hard case is found much less often than the typical model and they were made for only a few years after the model change to 68-1749 and when K & E finally got out of the slide rule making business after the introduction of electronic hand- held's.

This particular rule is factory engraved with the name Elton W. Reither. Elton was the area manager for K & E  in Puerto Rico and the Caribbean during this time period and this was a presentation slide rule given to him either upon promotion or retirement. This rule was consigned here by his family and has been with them since that time.

The condition is like new. There is no damage to the rule or box. Note the condition of the finish on the mahogany in the views from the back. The paper conversion chart there is flawless as well. The pads on the cast iron feet show no wear either. A super piece of calculation history in super condition.

Good+  . . . . . $295.00         SOLD!

Keuffel & Esser 4053-5 20" Slide Rule w/ Leather Case Box & Book  The condition of this 20" K & E Sliderule is very nice. It is still in its original plastic sleeve.  There is no damage to the rule, cursor, or green leather case.

Fine . . . . . $165.00          SOLD!!

K & E Deci-Lon Slide Rule    The rule and  the exterior of the case are in super condition.

Good . . . . . $75.00       SOLD

K & E / Keuffel & Esser 4045 16 Inch Slide Rule   16" rules are very hard to find. The box is tattered, the rule is nice!!

Good +. . . . . $75.00          SOLD!!

K & E / Keuffel & Esser 4088-2 SM Slide Rule   Although 4088 rules are pretty common, it is pretty rare to find one this nice w/ the bells and whistles this one has. The S designates the sewn case and M the hard to find magnifier.    Very Unusual and very nice!!.

Fine . . . . . $95.00       SOLD!

K & E / Keuffel & Esser # 4100 Stadia Rule w/ Magnifier & Hump Leather Case & Box   This is a nice looking K & E 4100 Stadia sliderule designed for use in the field or office of surveyors and engineers. The scales are set specifically for surveying and working with angles and elevations. There are instructions on the back side.   It is a rare combination with the magnifier, case and box  The green box is unmarked but a proper K  & E product. The condition of the rule and case are like new.

Fine  . . . . . $145.00       SOLD!

2 K & E / Keuffel & Esser 4181 Slide Rules   Although different sizes both of these 6" rules are marked 4181. You get the box and book in the last pic as well, so you get 2 rules and 2 boxes for one money.  Very Unusual and very nice!!.

Fine . . . . . $95.00       SOLD!

K & E / Keuffel & Esser 4100 Stadia Slide Rule   This is a very nice, and very hard to find stadia or surveyors rule by K & E. Stadia rules were used by surveyors or engineers to figure elevations and distances in the field. Very Unusual and very nice!!.

Good + . . . . . $125.00      SOLD!!

K & E / Keuffel & Esser 4133 RoyLance Electrical Slide Rule   This is geared toward electrical calculations and is a hard to find 8" rule. The frameless cursor would date it from just after the turn of the century. Very Unusual and Very Nice!!

Fine . . . . . $85.00       SOLD!!

K & E 4100 Stadia Rule  Nice.

Fine . . . . . $150.00        SOLD

M. H. Reymond  Patented 1924 Leather Calculating Slide Rule   This is a rare slide rule. I have had one other in over 20 years of buying and selling sliderules. I have only seen 2 others sell in all that time. The one I had, like this one, came from New England which was the center of Americas' shoe making industry back before the age of sneakers and the export of our manufacturing base put an end to that industry in the US.Although it is not marked K & E it is a known fact they made it. K & E, or Keuffel & Esser were known to make specialty rules, but I have never seen it listed in a catalog.

Mr. Reymond held several other patents for devices related to leather as well. I have never seen those. Think about the size of the possible market for a rule like this even in the heyday. How many buyers of leather hides for the shoe making industry were going to need, or needed to carry one of these around to figure out how many pairs of shoes were going to come out of a given cowhide they were about to buy.  This rule is an prime example of filling a need that existed in just a few peoples minds. That is what makes it a good one and a rare one.

The other one I had predated this example, as this one is clearly marked with the patent date as well as the copyright dates. The serial # on this one is 297. I imagine that very few were produced, and that even fewer survived. 

Overall the rule is very nice. There is some old writing on the surface as if the owner was making his own calculations at one point. Also there are two small empty holes that make it seem that a pointer may be missing or has been moved. There are 3 present    The box is nice and shows good age.  There are not going to be a lot of opportunities to own another one of these. A very interesting rule for the collection. Opportunity!!

Good + . . . . . $475.00       SOLD!!

Reymond  Shoe Leather Calculating Slide Rule   This is a rare slide rule. It is a first model and marked patent appl'd for.

Good + . . . . . $675.00       SOLD!!

Keuffel & Esser / K & E 68 1400 ANALON Slide Rule w/ Leather Case     The condition of this rare K & E Sliderule is very nice. There is no damage to the rule, cursor, or orange leather case. The 68-1400 Analon was one of K & E's last specialized rules, it is said that there were but 1000 made making this one with serial # is 009619 one of the last. Super hard to find.  A piece of calculation history in super condition.

Fine . . . . . $495.00        SOLD!

K & E / Keuffel & Esser 4100 Stadia Slide Rule   This is a very nice, and very hard to find rule by K & E. Stadia rules were used by surveyors or engineers to figure elevations and distances in the field. The cursor is a little dirty, but the rule box and case look to have never been used. Very Unusual and very nice!!

Fine . . . . . $175.00       SOLD!!

Keuffel & Esser / K & E 68 1749 (Old 4096) Merchants 20" Desk Top Slide Rule w/ Hard Case  The 68-1749 desk top slide rule was offered for use in offices or atop most any desktop. It came in a hard case and was equipped with feet to hold it on an angle in front of the user. Prior to 1962 it was numbered 4096 or N4096. At some point near the end of their production of slide rules K & E changed the numbers to ones like this beginning in 68. This later variant in the hard case is found much less often than the typical model and they were made for only a few years after the model change to 68-1749 and when K & E finally got out of the slide rule making business after the introduction of electronic hand- held's ended their long run of slide rule making.

The condition is very nice. There is no damage to the rule, cursor, or box. Note the condition of the finish on the mahogany in the views from the back. The paper conversion chart there is flawless as well. The pads on the cast iron feet show no wear either. A super piece of calculation history in super condition.

Fine . . . . . $275.00        SOLD!!

K & E / Keuffel & Esser 4110 Power Trig Slide Rule This unusual slide rule was never offered in a K & E catalog. Research has indicated that it was produced special order for the Naval Academy. The idea was granted a patent in 1942 and issued to professors there. There is a pretty detailed history discussion of the rule on McCoys slide rule site that is easily findable with a Google search. The Journal of the Oughtred Society has several articles about the K&E 4110 Power Trig slide rule with the most current in 2011 with some good current info.

It is a one sided rule with nine scales, P, F, A, B, T, S, CI, C, D, The condition is pretty nice. The cursor is damage free. The previous owner did inscribe the back w/ his name as shown. The hard case has seen better days.

Good + . . . . . $150.00      SOLD!!

Keuffel & Esser / K & E 4160 S Chemists Slide Rule w/ Leather Case & Box  The condition of this unusual and rare K & E Sliderule is very nice. There is no damage to the rule, cursor, orange leather case or outer marked box.  Nice!!

Fine . . . . . $195.00      SOLD!!

20" Keuffel & Esser 4053-5 Slide Rule w/ Magnifier & Leather Case  The condition of this K & E Sliderule is very nice. There is no damage to the rule, cursor, or orange leather case.

Fine . . . . . $125.00      SOLD!!

Keuffel & Esser # <4110> 14.5" Slide Rule  The rule itself is in super condition. The serial # is 799672. The case body is OK, showing normal wear and age and the flap has been taped on with Priority tape. The framed cursor is flawless. The rule is straight, slides nicely and has no problems. There have only been a couple of these offered over the past couple of years on the internet. and it is a rare rule that was not offered in any of the catalogs that I have, and was given a 5 rating in the cheat sheet that I have. I have given you a shot of the side with the scales so that you can decide what exactly the unusual scales are and what it was intended for.  I have read that these were made for West Point, but really have no information on that.

Good . . . . . $275.00       SOLD

K & E Deci-Lon Slide Rule 68-1100 in Original Box and Case Serial #088272   The rule and  the exterior of the case are in super condition. The owner, Guy Endicott did stamp his name into the exterior of the case, and wrote it again inside the flap. Otherwise the rule and case are minty nice. The box is nice noting that the price and the fact that this was 12 of 17 was written on the lid in marker. The book appears to have never been used, and as can be seen the lifetime guarantee is includes as well. These are tough to find in this condition.

Good . . . . . $275.00         SOLD

K & E <N4088-3>  12" Slide Rule w Column Cursor   The rule itself is very nice. There are 2 patent dates on the top rail from June 5th 00, and Dec. 22 08. The original owner a Mr. Robert Morrison has carefully scratched his name into the end plates holding the rule together. It has K & E's second model column cursor and there are no problems, damage or cracked glass in it. The case is  in a sorry state,  missing its top and being taped top and bottom, but is original, as he same owners name can be found here as well. Rare and worth the expense.

Good . . . . . $175.00        SOLD

Keuffel & Esser Peerless Reckoning or Calculating Machine   Keuffel & Esser offered this type of machine from about the turn of the Century until 1922. They referred to it as "The Perfect Calculating Machine" I believe this model operates on the stepped drum mechanism.  This is the earlier model, and my K & E catalog from 1913 shows the later model with metal sides and legs. This is a great looking machine and is fully operational. I believe it is the #4007 that went out to10 places and the catalog says it is capable of 20 places. They made smaller models as well, but this was the largest size produced. It is fully operational and the only detraction is the cracked slate board in the left corner for the operator to do rough preliminary calcs on. Looking at this you really can get a sense of just how far we have come in the last 100 years.

Good . . . . . $2450.00        SOLD

K & E Deci-Lon 5 Slide Rule 68-1130 in Original Box and Case Serial #010628   The rule and  the exterior of the case are in very nice condition. It appears that at one point there case did get wet or dirty on one of the top flaps and is slightly discolored on the inside. It still looks OK. The box is nice, and has the outer slip cover as well. Also included is the lifetime warranty, I wonder how that works, do they give you a new hand held calculator? when this one breaks.   The care and maintenance pamphlet is here also. These are tough to find in this condition, and in their boxes.

Good . . . . . $295.00          SOLD

Keuffel & Esser  <4031> 5" Slide Rule w/ Frameless Cursor   This 5" K & E rule is in excellent condition, and so is the case. The serial # is 97938.   The hard to find frameless cursor is damage free and rarity in itself. A hard to find rule that was not produced for long with this style cursor. You will not find a nicer one!

Good . . . . . $75.00       SOLD

K & E #4160 Chemists Slide Rule  The rule and leather case are near flawless and the Keuffel & Esser #4160 Chemists rule  is one of the most desirable and sought after of all specialty rules that Keuffel & Esser ever produced. As an added bonuses this rule is coming with the hard to find magnifier that K & E  sold as an accessory and the special case  with the provision for the magnifier built in that the proud owner also bought to protect his new investment. He even kept the cardboard box, as can be seen, which is a Generic for the humped case to fit the 4160 and a few other rules. The end label on this box gives the other model slide rules that this case could also be used with.  All in all a special rule in exceptional condition and ready in all respects to take its place high up on the shelf in the collection.

Good . . . . . $250.00        SOLD

Keuffel & Esser #4133 Roylance Electrical Slide Rule  This is the sort of rule that is getting to be harder and harder to find, especially in this kind of condition. It is all nice, and the first one I have come across in several years.

Good . . . . . $75.00         SOLD

Keuffel & Esser <N 4096>   This unusual 22" desktop slide rule is in super condition. The serial # is 509117 There are no problems other than one small flake from the laminate on the bottom rail. This is a rare and unusual example of the top of the line desktop model rule that came equipped with cast iron feet to hold it at the proper angle. There is also a knob to slide the middle leg along. I do not know where the box went, but it is obvious that this super rule saw little if any use over the years.

Good . . . . . $175.00        SOLD

Fullers Computing Telegraph Calculator w/  Palmers Computing Scales  It is no wonder that America was the leading power during the industrial revolution. They had people designing, patenting, and introducing calculation devices like this one. This unusual calculation device  was light years ahead of the competition and probably led to the  introduction of many other new products and ideas. The Palmer scale says it was first patented in the 1840's, and I guess after Mr. Fuller improved on it he included it with his own version of a circular slide rule. Luckily he had the foresight to include with it a booklet of operating instructions   The opening blurb in the instructions claims this is "The Great Master Key Rule by Which All Problems are Instantly Solved.  I am not really sure if it could have solved Bernie Madolf's problems. 

The entire package is in very nice condition, and they are rarely seen in this nice condition any more.

Excellent  . . . . .$795.00        SOLD!

Poor's Line of Position Navigation Computer  This is a rare and interesting navigation related calculator. There are a couple of references on Google about it lamenting the fact that so few are known, and that only pictures of it can be found in a book by the inventor Charles Poor.  The face is marked Pat applied for, and it is not known if one was ever granted

This calculator is in like new condition with it original box. The box has seen better days and the corners are torn and weak. The instrument measures approx 12" dia. and the base is cast aluminum. The instructions are present and in very nice condition. It says it is a mechanical navigator for use on ships or aircraft. At the bottom in addition to the inventor designers name, the name T.S. & J. D. Negus is given as the seller. This was a well known outfit that dealt in all manner of navigational and nautical related devices.

Good+  . . . . $1295.00        SOLD!

Loga 30 R C Circular Slide Rule / Calculating Disc Also marked USTER - SCHWEIZ. This Swiss made two-sided circular slide rule does it all. These came in different models, and the 30 R C does all sorts of Business related weight & measure conversions. It also does money conversion. It looks like British monetary units are on the outside rings on one side.

The instrument is 5 inches across. The case is 6 inches across. This is beautifully made and in Fine condition. It comes with the original, zippered leather pouch and a booklet of instructions. Also in Very Good condition.

Fine . . . . . . $60.00        SOLD!!

Stanley Fuller / London England / Spiral Calculator / Sliderule This Stanley Fullers Spiral Calculator / Slide rule is in nice condition. This is an example of a calculator that is getting harder and harder to find. They were first introduced in the 1880's. At first they were made and offered by Stanley of London a well known firm that also made the famous Thatcher calculator, and other surveying or engineering related instruments. Later on K & E bought the rights and offered them until the end of production in the early 70's.

The serial #'s numbers on the brass scale are 6900 -37. I believe that indicates it was made in 1937. It has the brass external mount feature so that the slide rule can mount  for use on the outside of the box, but the mounting bracket itself is missing. The box is pretty nice, and  is mahogany. It has a finger joint design in the corners. It has a nice green Stanley label inside the top. It is in overall good condition noting the remnants of another label or sticker on the outside top.

The inner scales are very nice. It has the typical scales and charts found on these type one model calculators, and the outer scale has the typical light brown tint to it.  The scales, both in and out are in very nice condition noting just a few minor dings. The short pointer is marked Fuller Calculator, and Made in England. The long cursor in addition to having the date and serial number is graduated along one edge. A nice piece in outstanding condition.

Good + . . . . . $300 - $500         SOLD!! 

Fuller Spiral Slide Rule / Calculator   The condition of this Fuller slide rule is like new / mint and came from the original owner. These slide rules were produced in England by the W. F. Stanley Co. The Fuller Circular slide rule was first developed and introduced in the 1870's.

The serial # on this unusual circular drum style slide rule is 13643 /70 dating it from 1970 and very close to the end of their production nearly 100 years later.  It has been suggested in online write-ups that no more than 14,000 were made during their entire production span. Production of this slide rule was very limited by this period and this example is one of the last few hundred made when production ceased in the early 1970's.   There were several different models produced and offered over the years. This style would be referred to as the type 1. Over the course of production different US companies like K & E and Dietzgen offered this rule as part of their line. This one is just marked Stanley / England.

The mahogany box is like new. The original instructions are included. The top and bottom of the rule are Bakelite and chip, crack or damage free. The brass rod to mount it to the box for convenient use is present. This rule is essentially new and unused. It will make for a great addition and marks the end of an era with the introduction of electronic calculators which made the obsolete and yet created a fine collectible.  A classic!!

Fine +  . . . . . SOLD!

Fuller Spiral Calculator by Stanley   This is an earlier model than the one above. It does not have the external mount like the one above as the earliest models did not offer that feature. The number on the brass scale is 109 and that number is repeated on the base of the scale. I assume that is the serial # which would date this pretty early in the scheme of things.   There are no tears to the scales and they are pretty nice on both the inner and outer drum.  There is some very minor spotting to the scales, but the overall condition is very nice. There is a tight crack in the box top as can be seen, and there is an early repair to it that adds a degree of character to this interesting and early calculator.  A nice piece in overall very nice condition.

Good . . . . . SOLD

Stanley Fuller Spiral Calculator / Sliderule This is a super nice condition example. The numbers on the brass scale are 5968 -28.  I am not sure where that would put this date wise, but it is an later model with the brass mount feature that the slide rule can mount to for use. There is a hairline crack as can be seen in one of the pics in the wood frame, but it is just a line in the wood. There is no damage, movement, or looseness. The instructions are included as well. The John Davies label inside the lid must be from the distributer, who specialized in Mining supplies as well as surveying instruments and more. That label mentions 1933, but it is unclear in what regard. A nice piece in outstanding condition.

Excellent . . . . . SOLD!

Stanley Type 2 Fuller Spiral Calculator / Sliderule This is a  nice condition example of a very hard to find variation of a Fuller / Stanley slide rule calculator. The numbers on the brass scale are 5836 -27.  I believe that would date it from 1927. The finger joint mahogany wooden box has a Stanley paper label in the top, as well as a tag, from I assume, the factory it was being used in. I am not sure what the name of that company was, but the tag says it is from the aircraft division and 54 over 14690. The box is OK noting one latch is missing, and there are some paint spots on the top. It does have the mounting bracket on the end of the box, and the proper bracket to mount this calculator is in the box.

As for the rule itself, the scales are pretty nice with just a few small dings here and the typical yellowing the paper scales develop. There is a hairline crack in the top wooden donut as can be seen in one of the pics. It is just a line in the wood,  there is no damage, movement, or looseness.  There is also some minor staining, dirt and chipping of the paper at the top and bottom of the outer cylinder. The short pointer is marked Fuller Calculator with Scales of Sines & Logs Made in England. This is what makes this model so unusual.  One can see the difference immediately on the inner scale as there are none of the typical tables or equations usually seen. This inner scale is made up of 2 sets of scales from top to bottom. A rare piece in nice condition.

Good + . . . . . SOLD! 

Gordon's Addometer / Calculator  This is an interesting, early, and rare adder. It is marked on the inside ring "Gordon's Addometer / Patent Applied For". The circular body is made of Gutta Percha type plastic material. There is a  crack in it from shrinkage. It is stable and the calculating rings can still be rotated.  The cover is a nickel plated non- magnetic material like brass. I believe unusual circular adder dates from the last quarter of the 19th century, and perhaps as late as the turn of the century.

A Google search turns up just one reference for the Gordon Addometer from a German site listing the name but there is no patent info or other info at that site. Most Addometers are much later than this and there is plenty of info on those. A Google Patent search turns up nothing for Gordon Addometer. I tried for over an hour to find something similar and  I looked at a lot of other devices called addometers and perhaps the reason is that this design was an infringement and was never granted a Patent. I am not sure.

I do have a bit more information from the owner. This is one of just 4 of these that was found in an attic in New York near the New Jersey border about 20 years ago. The parties in that original transaction surmised that the inventor had just a few of these made as pre-promotional examples, but that something then transpired that stopped the patent process and any further manufacture or development. When these were found two were sold privately, and one was placed in the German Breker Technology Auction, where it sold in the 4K range. This is the last one that remains, and when this one goes that is the end of them.

Opportunity knocks.

Good . . . . .$3250.00         SOLD

Loga Drum Calculator / Sliderule   This large cylindrical slide rule / calculator is a Swiss idea that was produced just after the turn of the century up until about 1920. They came in a few different configurations and with different bases or covers. This ones instructions are missing, but the rule is otherwise pretty nice. The cover has a couple dents in it, but is OK.  It measures approx 18" long and I believe is the largest model offered.

Good+  . . . . .$795.00        SOLD!

Loga Drum Calculator / Sliderule   This large cylindrical slide rule / calculator is a Swiss idea that was produced just after the turn of the century up until about 1920. They came in a few different configurations and with different bases or covers. Note in the other pics how it is able to swing up to be like a Fuller. This one has a set of instructions on the base and a second revolving reference / information area as seen in the bottom pic. 

Good+  . . . . .$1295.00        SOLD!

The Locke Adder This unusual sliding bar adder was patented in Kensett Iowa in 1904. This is kind of late in the scheme of things as far as the design of calculators and adders was progressing, and probably helps explain its relative scarcity as it probably was not very popular and seemed dated to potential buyers it was offered to. This example is in Good- condition with some paint loss to the body. The slides all function as they should. An interesting piece that clearly demonstrates just how far we have come.

Good . . . . .$395.00         SOLD

The Universal Adder Patented July 15th 1890  This unusual sliding bar adder according to the info on the front case was patented in England France Germany and Canada as well as the US on the date found on the left side of the case. It was a well done and interesting design, with a window in the back of the unit to view the current result. The body is made of some sort o early plastic / gutta perch a type material, and it has warped somewhat over the years, making sliding some of the scales a bit difficult to achieve. Overall the condition is very nice otherwise. There is also remains of a label and instructions on the back side as can be seen in the second picture.

Good . . . . .$695.00         SOLD

"Simplicitas" Addizonartrice  Despite its name "Simplicitas" this adder is anything but simple and is as complicated an adding machine as I have ever seen before. And I should note, I have never seen this one before,  and can find no mention of it running searches on the internet or visiting several sites I know of that cover these pieces.  

As can be seen it has 9 dials mounted on a nicely finished wooden board. It measures approx 22" long overall. It comes in the original fabric / faux leatherette case. Note there is one small ding in the top right corner of the back board. Overall it is very nice though. It has its original bone or ivory pointer as well.

The layout, with a single dial to the left, and then a group of 3, and then a group of 5 with 2 above 3, must mean something, to someone, but is beyond my reasoning capabilities. On top of that, each dial has 3 scales. 1-9 on the outside,  then another 2 different scales under the wheel with one going into at least double digits. All of the dials are independent of each other and do not carry from one to the next. We need the instruction manual for this one, or you can spend a few minutes figuring it out.

Good . . . . .$1495.00         SOLD

Fowler Type H Calculator  Fowler is a well known English name in circular sliderules / calculators. This Fowler pocket watch style calculator is in super like new condition. The original instructions are nice and included. The outer box is tattered. There is a small piece of plastic that was used as a magnifier. A very nice example.

Good . . . . .$295.00        SOLD

The Hart Calculator or Equationor  I can barely use some of the simple examples of these calculating marvels from an earlier time that I have had,  and I routinely use to flunk most of the math courses that I had to take in school,  but there must be a latent gene that drives the quest as I cannot seem to stop buying these sort of things. Vintage calculators, slide rules, and other calculation devices are still available and it is always fun to find a different one while on the hunt.

SOLD






Millionaire Calculator - Calculating Machine  The idea for the Millionaire Calculator design was first patented in 1892 by Otto Steiger of Munich Germany. Steiger's design was later improved upon by Hans W. Egli of Zurich Switzerland. The tag on the left side of this example has the Egli name. This example is also marked with two US patent dates from 1895. Production of the Millionaire Calculator began in 1893 and ended in 1935. A total of about five thousand were manufactured. From the serial # 1633 we can assume this example dates from just after the turn of the century. There is an online registry for these calculating machines found at John Wolff's Web Museum / Register of Millionaire Calculators. He has a number of examples listed, (over 200) and many examples are pictured there.

The Millionaire calculator was the first commercially successful mechanical calculator that could perform direct multiplication. Other calculating machines of the period were adding machines that accomplished multiplication by preforming addition calcs over and over. A much slower process. This aspect of the design is explained in great detail at the www.history-computer.com site. The tag on the left indicates this example was sold here in the US. The tag reads W. A. Morschhauser Sole Agent Madison Ave New York City. I read these machines retailed for between $475.00 and $1100.00 at the time of manufacture. A huge sum for the time.

Note the exceptional condition. This Antique Millionaire Calculator shows very little signs of use and mainly just storage scuffs. This is the less common metal case model. The Millionaire Calculator also came in wooden cases. Overall It is in very nice condition with typical scratches. On the interior, the areas under the swinging arms still have nearly all of the original black finish. Many examples you can view online show considerable wear in these areas. It is a large and heavy machine. The measurements are approx. 7 1/4" x 25 5/8" x 11 1/4". It weighs close to 70 lbs. and is the 8 column model. They could be had in larger sizes with up to 12 columns. A rare opportunity to own a piece of calculation history. Recommended.  

Fine . . . . . $2450.00        SOLD!!

The Calcumeter    This is the smallest 5 place model of this patented adder. These are 10 times harder to find than the larger models. It is in very nice condition noting one bent corner.

Good . . . . .$195.00         SOLD

Percentage Calculator   These are usually associated with stores where the operator was trying to figure out his profit or discount to be given. This one is Tole Painted and probably dates from just after the turn of the century from the look of it.

Good+ . . . . .$125.00         SOLD

1st Model Webb Patent Adder  The Webb Patent Adding Machine came in 2 different models with this the brass version mounted on a mahogany board the first and earliest model. Later versions were brass that was nickel plated.  This is properly marked with the patent date, and the serial #.

Good . . . . .$895.00         SOLD

1st Model Comptometer / Adding Machine  The Comptometer was a huge success and the later models are considered quite common. These earlier version in the wooden case are quite hard to find, and entire websites have been set up to provide, and gather information about them. There is a site where you can register early ones like this, and just a fraction of those made have been documented.  This is a nice one and an opportunity not to be missed.

Good . . . . .$2495.00          SOLD

"Small" Pocket Calculator / Slide Rule  This unusual  slide rule / calculator was patented, but there was only one production run and few of those were sold until a stash of them was found back in the 70's or early 80's. That small stash was qu9ckly gobbled up and they are rarely seen now that the limited supply has been distributed. This is a nice one.

Good +  . . . . .$695.00         SOLD

The Rapid" Calculator / Adder This is a very complicated and precision made adder / calculator. I have only had a few over the last 20 years. I know firsthand as my last one had a small problem carrying over, and after I got inside, and started taking it apart, I regretted it. I am sure I voided the warranty on that one. This example is near mint and operates just fine. Personally though, I would buy an electronic hand held for a 1.00 and leave this one for display.

Good+  . . . . .$295.00        SOLD!

Marchant Calculator   The Marchant Calculator company was based in Oakland Ca and began operation near the turn of the century with their non-electric pin wheel design calculators that are well known and highly collectible. The Marchant in the Click for Pic is the black one on the right. The condition is excellent. The label on the back lists off all the different Patents that were designed to protect it, but Marchant is but one of the names associated with this design, so they were either selling the rights, or they were in production for a long enough time for copies to be made.  As the technology grew they moved on to electric models. This earlier model is in very nice condition and seems to be fully operational.       

Good+  . . . . .$195.00        SOLD!

Walther Calculator   The German Walther company was best known for manufacturing weapons and pistols. In 1926 they branched out to include a line of calculators. The condition of this example is very nice looking but it is jammed up.

Good  . . . . .$225.00        SOLD!

"The Jeffers" Calculator   This is a very unusual and complex Agricultural related calculator. It is in super near unused condition. It is a wooden box that opens to reveal the calculator inside. It measures approx 5 x7". Inside the front door on the left side are the instructions and explanation of what you would need this for and how to use it. Basically it is for computing just the right mixtures of feed and ingredients for livestock nutrition derived from different ratios of mixtures of different grains and meals. Sound complicated, just try using it to see how tedious it is.   I think that pretty much explains the condition, as I would be willing to bet most of the livestock got whatever was available in the way of leftovers from the corn crop or other grain crops, and that was pretty much it.  There must be 60-70 different printed slides stored on the left which you would put into the holders on the right, and start computing the ratios, cost, weight and so forth. I have a feeling this did not go over real big with the typical country farmer, and back then, when the farms were pretty much family owned something like this was not really needed or desired. Perhaps today, and perhaps the Chinese should be using something like it before they add to much of whatever to the next batch of dog food, or your food.

I looked it over, and tried it out, and I can confirm it is pretty much non understandable. That is what makes it a great collectible in the field of calculation.        

Excellent . . . . .$195.00         SOLD!!

"The Locke Adder" This unusual sliding bar adder / calculator was patented in Kensett Iowa in 1901. These unusual adding machines can be found marked with a second patent date from 1905 as well, and so I assume we can call this the first model.

This adder seems kind simplistic in the scheme of things as the design of calculators and adders had been progressing rapidly and was well advanced past this design by 1900, but I guess they had not heard that in outer Iowa and about what was going on in the rest of the world. This probably helps explain its relative scarcity as it probably was not very popular outside of that area and seemed dated to potential buyers elsewhere it was offered to. That old world view probably explains some of the goings on in Iowa today as well.

This example is in excellent condition and show little signs of wear or tear. The main body is pressed steel in a copper flash finish, and the sliding adding bars have nearly all of their original paint. The slides all function as they should. An interesting piece that clearly demonstrates just how far the field of calculation has come and how Iowa fits into the picture.

Good . . . . .$495.00        SOLD!!

1st Model Wooden Case "ShoeBox" Comptometer Adder / Calculator   The serial # on this 1st model Comptometer is 2190. It is stamped into the metal cover over the counter area near the middle.   These early wooden case comptometers were offered beginning in 1887 and were sold through 1903. During that period a little over 6,000 were produced. After that the machine was cased in a metal housing. The basic idea remained pretty much the same while going through a number of minor cosmetic changes over the years.

There is a very informative and worthwhile site that details the history, design, operation, and other info about these machines on the internet. It can be found at www2.cruzio.com . This 1st Model Comptometer is listed there along with the other known wood case examples that have turned up. Known wood case models number under 100 according to this chart. This example came from at descendant of the original inventor / maker whose name was Felt.

All of the main keys seem to operate as they should. There are none that are stuck. By manipulating the key strokes I can get it to zero out, but the black knob on the side which is supposed to zero it does not turn or operate. The wooden return lever moves but does not seem to do anything.   In general when pushing the main keys it seems to carry over pretty good, except for the last column which seems to skip or overcount at times. The main parts of the case are in Mahogany and the base appears to be a softwood like pine. The outer case is in very nice condition and looks to be original finish. The bottom cover door is missing.  A new panel could easily be fabricated if wanted.  These wooden case comptometers only appear on the market occasionally. Some have been known to sell in the $4000 - $6000 range, and we have this one priced to reflect the minor operational  issues mentioned above. A rare piece that will be a welcome addition to the advanced collection of early American calculation devices

Good   . . . . .$1295.00        SOLD!!

Three Different Webb Adder / Calculators   The Webb adder was first patented near the turn of the century. The first models were brass and mounted on a wooden board. The next generation looked like the one on the left. After that other versions appeared such as the Herring Calculator in the middle. These were designed to calculator / add weights  or loads of rail cars. It is a hard to find variation of this calculator. Finally on the right we have what has become the norm in our lives, an unmarked knockoff that was offered at the time as the real thing. . Much like most of the name brand stuff you see at flea markets today, unless of course the parent company moved production there, then it is called progress or Global something. It does not add up. Anyway, all three of these are pretty nice, and all seem to operate. Fill out the collection.

Left ..... Good+  . . . .$295.00          SOLD!

Middle ..... Good+   . . . . .$395.00        SOLD!

Right ..... Good+  . . . . .$225.00         SOLD!




Comptator Calculator / Adder   These two are basically the same with different makers names. The left one is German and has location info on the front.

"The Rapid Computer"  Calculator / Adder   The writing on this one says it was patented in the US in 1892. It says it hails from Benton Harbor MI. It seems to work just fine.  Very Nice!!

Left ...... Comptator ..... Excellent  .....$95.00        SOLD!

Right .... The Rapid Computer .....Excellent  .....$75.00 SOLD!




Odhner Style Mechanical Calculator   This mechanical calculator is similar in design and function to the American Marchant mechanical calculators made in Oakland CA around the beginning of the 20th century. The name on this example looks to be Russian or some other Cyrillic language and it may be an Odhner which have similar features like the wingnut zeroing knobs this one sports. Odhner calculators were first made in Russia in the 1870's after which production was moved to Sweden. There are many other brands or makes of mechanical calculators similar to this as it was a popular design that was produced worldwide well into the 20th century. It is functional and not bound up or jammed. The overall condition is very nice!!

Fine  . . . . . .$95.00          SOLD!!

Comptometer Mechanical Calculator   This mechanical Comptometer calculator was cosmetically restored and sold by This Olde Office an outfit that dealt in Antique office equipment that was based here in CA back in the 90's. The owner bought old used office equipment and repainted and "restored" them creating antiques for the decorating crowd not only in CA but worldwide. It looks great, but this vibrant color is not one used buy the actual company. Interesting.

Fine  . . . . . .$15.00         SOLD!!

Burroughs Glass Side Adding Machine / Calculator    Without a doubt the Burroughs Adding Machine is one of the most graphic if not heaviest of all 10 key adders / calculators ever made. This one looks great with its see through glass sides so one could / can see how the mechanism worked when operated. The stand is original and nice.  Quite impressive!   It was restored / repainted and sold by This Olde Office which was located here in CA back in the 90's. It comes complete with a framed letter of authenticity which authoritatively and definitively guarantees that this is in fact an adding machine. Thor did nice work.  A great reminder of what it use to be like. Nice!!

Good +  . . . . . .$195.00       SOLD!!

A. Burkhardt Type A Arithmometer   This early stepped drum adder / calculator is in nice overall condition. From its features and low # 72 serial number It would be a first model called the Model A produced in the 1870's. The basic design of this style calculator was first designed over 100 years earlier and there are numerous bios on the inventors and histories of this style stepped drum calculator called and Arithmometer that can be found on the internet. I read the original design was developed by Liebniz. Mathias Hahn & Thomas de Colmar created versions of their own design after Liebniz. A. Burkhardt was German and is credited with being the first in Germany to produce them. Over the years he produced several different models with this style being the earliest. This same basic design calculator can be found with several other names from different locals as well.

This example wants to work, but does not work properly or consistently. I believe it is just an adjustment.  I see do damage, bent pins, missing parts or the like on the underside. It will work for small amounts, and sometimes for larger ones, but then will hang up. It zeros out and the carriage moves OK. Also the division function works - - - - sometimes. On the left the small framed slate board is missing over the open hole. There are also 2 of the miniature thumbscrews missing from the first two digits on the upper far left. You can see this in the pics.   

A rare and unusual calculating machine, especially being the early model with such a low serial number. Worthy of inclusion in any collection with a focus on Office antiques, calculation, or technology advancement. 

Good   . . . . .$1995.00        SOLD!!

The Calculus Calculator   This is a calculator I have never seen or had before. This unusual dial / drum type calculator claims it was patented on January 22nd 1907. It also has the maker name James J. Hinde Co. of Cleveland O. on the side. The catchy logo / phrase under the name reads "Proves as it Calculates".

I could not find the patent with Google Patent Search. I did find an ad in a lumberman's magazine touting it usefulness for use in that field or trade. A few other references to this calculator can be found on the internet, but scant examples are pictured or discussed. The internet site that deals with office antiques like pencil sharpeners, staplers, and the like also has an ad for one of these showing  the user sitting in front of a larger and what looks to be ganged together unit. The dimensions of  this stand alone Calculus Calculator unit are 4 x 5 x 18". Note the folding leg / stand that angles it for easy use.

It looks as if it is meant to calculate the price of multiple units. The rotating drum is broken down into 1/4 increments starting at one and going up to 80, or maybe 100. The columns are the top number added to itself over and over again in different ways   A lot of it makes no sense to me, and I have provided numerous pics below to help you determine just what it is capable of doing.   Different!!

Good +. . . . . $795.00        SOLD!

1st Model Webb Adder / Calculator   The Webb Adder was first patented near the turn of the century and the first model had a brass face and mahogany back as seen here. They were also marked with a serial # and this one is # A-5664. The next generation were all metal and nickel plated like the ones just below.  The patina on this one is great, and it seems to operate just fine and does carry. The earlier versions are becoming very difficult to find, hardly ever offered for sale and this is a great looking specimen. Very Nice!!

Good+  . . . . .$695.00        SOLD!

1st Model Wooden Case / Shoe Box Style Comptometer w/ Fractional Keys  The serial # on this 1st model Comptometer w/ fractional keys is 5539. It is stamped into the metal cover over the counter area between the 4th and 5th window. These early 1st model wooden case comptometers were offered beginning in 1887 and were sold through 1903. During that period a little over 6,000 were produced. After that the machine was cased in a metal housing. The basic idea remained pretty much the same while going through a number of minor cosmetic changes over the years.

There is a very informative and worthwhile site that details the history, design, operation, and other info about these machines on the internet. It can be found at www2.cruzio.com . This 1st Model Comptometer is not listed there with the other known wood case examples that have turned up. Known wood case models number under 100 according to this chart and just a couple have fractional keys.Doing the math, it can be assumed that one, very few comptometers were made with fractional keys, and 2, that even fewer have survived.

All of the main keys seem to operate as they should. There are none that are stuck. By manipulating the key strokes I can get it to zero out. Beyond that it is not tested.  The main parts of the case are in Mahogany with its original crusty finish. The base appears to be a softwood like pine and the bottom door is present.

These wooden case comptometers only appear on the market occasionally. Some have been known to sell in the $4000 - $6000 range. This 1st model fractional key comptometer is rare piece that will be a welcome addition to the advanced collection of early American calculation devices. Very Nice!!

Good +  . . . . .$4500.00        SOLD!

Class Room / Teaching
Slide Rules

This.

Pickett N500-ES 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N500-ES Log Log rule and has 22 scales. It dates from the 1960's.   Nice!!

Fine . . . . . $350.00

Pickett N1010-ES Trig 7' Classroom Teaching Aid Slide Rule  The condition of this 7' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. I do not think it was ever used. Nice!!

Fine . . . . . $350.00      SOLD!!

Pickett N4-ES 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is exceptional. It is model # N4-ES Vector Type Log Log rule a more complex model than the more typical classroom size N-1010 you see offered all the time. It has 34 scales. It dates from around the 1960's and just before handheld electronic calculators hit the market big time. Nice!!

Fine . . . . . $350.00          SOLD!!

Pickett N1010-ES Trig 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. I do not think it was ever used. Nice!!

Fine . . . . . $325.00      SOLD!!

Pickett N1010-ES Trig 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. I do not think it was ever used. Nice!!

Fine . . . . . $325.00     SOLD!!

Pickett N1010-ES Trig 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. One ding as pictured on the back side. Nice!!

Fine . . . . . $375.00      SOLD!!

Hutten's Commercial Slide Rule by Nestler  The overall condition of this unusual merchants sliderule is nice. There is a small stain on one end. There is no damage to the rule, cursor, or hard black case.

Fine . . . . . $45.00     SOLD!!

Sun Hemmi # 256 Electronics Slide Rule This is a nice condition rule still in its marked plastic sleeve. It has seen little use. It has a very unusual setup on the back side and is geared toward electrical calculations.

Good + . . . . . $75.00     SOLD!!

A. W. Faber "Castell" No 378 Electronic Slide Rule This Bavarian made slide rule is geared toward electrical calculations with the words Dynamo, KW, HP, Volt etc. There are numerous sites online that discuss its use. It has 3 cursor lines. It is in fine condition as is the case.

Fine . . . . . $34.50           SOLD!!

A. W. Faber Slide Rule w/ Hard Case & Decimal Keeper Cursor The condition of this Sliderule w/ unusual cursor is very nice. There is no damage to the rule, cursor, or hard black case.

Fine . . . . . $50.00        SOLD!!

US Blue Co. 1876 Sun Hemmi Slide Rule w/ Magnifier   This bamboo and laminated plastic sliderule is about 11" long. The case says it is an 1876, and that is US Blue Co's number. This rule has its own Sun Hemmi number that I could not figure out and the rule itself has no model #. The interesting and rare feature here is the flip up or extendable magnifier. I found other examples w/ rectangular magnifiers, but no other round ones like this. I believe it dates from the 20's - 30's. Nice!!

Good + . . . . . $75.00     SOLD!!

Sun Hemmi 259D Engineering Slide Rule Pretty nice.

Fine. . . . . . $45.00       SOLD!

Faber Castell No 2/83N Novo Duplex Slide Rule This German made slide rule comes in its plastic case with instructions in German. It is in very good condition. It has some minor areas of discoloration / browning along some edges. It has 3 cursor lines. All the scales and other printing are clear and bold. The cursor is nice. There is a small break in the plastic case lid (top left corner) as shown in the pics. There are numerous sites online that discuss it.

Good + . . . . . $175.00          SOLD!!

Post 1460 Versalog Slide Rule An early version edge marked on the rail with model and maker info. Like new in the box.  Nice!!

Fine . . . . . $75.00    SOLD!!

Charvoz Aristo 971 Hyperbolog Slide Rule   This German plastic sliderule is like new in the box w/ case and instructions. Nice!!

Fine . . . . . $75.00        SOLD!!

Faber Castell Slide Rule 2/83 w/ Case and German Manual Overall nice condition. All plastic, good cursor. Includes plastic case and manual in German. One of the last rules Faber Castell put out.

Good + . . . . . . . $125.00        SOLD!!

Pickett #52T Air Force Photography Slide Rule  This aluminum sliderule is a Type 1-A. It is in like new condition.

Good + . . . . . $50.00        SOLD!!

Sun Hemmi #269 Civil Slide Rule This sliderule is like new in the box w/ hard case. Nice!!

Fine . . . . . $65.00     SOLD!!

Pickett #520-T Air Force Photography Slide Rule  This aluminum sliderule is a Type 1-A. It is in like new condition still in the wrapper. Nice!!

Fine . . . . . $60.00      SOLD!!

Post Versalog 1460 Slide Rule Made by Sun Hemmi. This is a very nice bamboo rule.

Good + . . . . . $50.00      SOLD!!

Post Teledyne Versalog 44DA-610 Slide Rule Made by Sun Hemmi. This 6" Versalog rule is the same as a 1461. A very nice bamboo rule.

Good + . . . . . $95.00     SOLD!

Calculator / Slide Rule Pen These mechanical pencils are a pretty neat calculator / slide rule designed to do multiplication and division. The instructions are here, but pretty tattered.

Good+ . . . . .$150.00         SOLD!

A. W. Faber #367 Slide Rule w/ Keeper Cursor This unusual slide rule is in very nice condition and is w/ its original hard case w/ advertising. Slide Rules with unusual style cursors like this are very hard to find. This cursor acts has what is known as a Keeper or counter allowing the user to keep track of his calculations as he works on a problem. The condition is super with just minor l9osses to the label on the box.

Fine . . . . .$145.00        SOLD!!

Fowler Long Scale Slide Rule / Calculator   Fowler is a well known English name in circular sliderules / calculators. They made a variety of different models and size calculators including many circular versions like this one. Some were designed for architects, or engineers, and others were made for the textile trades. Larger ones are referred to as Magnums, and this 2 3/4" model is referred to as the pocket size. This Long Scale Fowler calculator is in super like new condition with its outer hard shell marked case. The original instructions are included as well. There is a plaque inside the case that gives the location as Manchester England. There is a serial number under the glass on one side, but there is no specific model designation other than the long scale that I can see.

Excellent . . . . .$495.00         SOLD!!

Ross Meridiograph This is a field used calculator to determine the true azimuth. I suppose for use prior to setting up a solar transit or compass in areas where their use was required. It is by Ross who also made another unusual slide rule. There is a lot of paper that goes with it so be sure to see all the pics.

Fine . . . . . .$75.00        SOLD!!

Pickett N 300 T Slide Rule in Case w/ Box This is like new. A nice 6" rule!!

Fine . . . . .65.00          SOLD!!

Vernon Farm Calculator / Circular Computer / Slide Rule for Farm / Gestation    This unusual 12" farm related advertising circular sliderule / calculator dates from the 40's -50's. It was made by the Vernon Company of Vernon Iowa and was copyrighted in 1948 by George De Vries. They can be found with many different names and locations from all over the Midwest. I believe they were give-aways from different seed companies, grain dealers and farm equipment dealers. This one is from an outfit, Glen R. Green of Ridgeway MI that dealt in Ferguson Tractors and farm equipment.

They were a very well made device that held up well over the years and many are found in super condition. That is probably explained by the fact this was a solution looking for a problem that did not really exist. I doubt many farmers of the time really saw, felt, or understood the need to use it and most ended up in the drawer or hung on the wall. Look at all of the pics to get a sense of all the different things this could compute for the user. An interesting calculator in super condition.

Fine . . . . .$65.00        SOLD!

Vernon Farm Calculator / Circular Computer / Slide Rule for Farm / Gestation  This unusual 12" farm related advertising circular sliderule / calculator dates from the 40's -50's. The condition is like new. It was made by the Vernon Company of Vernon Iowa and was copyrighted in 1948 by George De Vries. It is complete with instructions for use. These calculators / computers can be found with many different names and locations from all over the Midwest. I believe they were give-aways from different seed companies, grain dealers and farm equipment dealers. This one is from the Critic Quality Feeds a well known outfit from that period.

They were a very well made device that held up well over the years and many are found in super condition. That is probably explained by the fact this was a solution looking for a problem that did not really exist. I doubt many farmers of the time really saw, felt, or understood the need to use it and most ended up in the drawer or hung on the wall. Look at all of the pics to get a sense of all the different things this could compute for the user.    An interesting calculator in super condition.

Fine  . . . . . $50.00     SOLD!!

Pickett #109 ES Circular Slide Rule This 109 ES Pickett circular slide rule is pretty hard to find, and it has its leather case as well. Nice.

Good + . . . . .$85.00      SOLD!!

Dietzgen Microglide Trig Type Log Log Slide Rule   This looks like it was made by Hemmi. Nice!!

Fine . . . . $85.00     SOLD!

Post 1491 Chemist Slide Rule   This is a Hemmi product. It is a pretty rare rule.   Nice!!

Fine . . . . .$125.00      SOLD!

The Standard Calcumeter   This is an interesting dial type adder / calculator. These can be found with different numbers of dials. This is an upgraded model with a reset dial on the far right. The patent info is on the side, and the ends are marked with a location and the serial number.

Just what every money changer needed to add up the days take or to calculate out his bonus.  Very Nice!!

Excellent  . . . . .$125.00      SOLD!

The Comptator Adder / Adding Machine in Wooden Case The Comptator is a multi-column adding machine with a stepped sliding mechanism. This version is marked Hans Sabielny Dresden and dates from the 1920s. This 9 column adder / adding machine is in fine condition.

To operate the stylus is inserted in the toothed slides and is drawn down advancing the register by the number of places. The slides remain in their final position so the value entered can be read back. The slides spring back to their home position when released by the lever on the left-hand side. The lever can be latched down to give an immediate return if checking is not required. The register has an automatic carry mechanism. To clear the result, the knob on the right is pulled out and turned anti-clockwise.

The machine was designed in 1891 by Peter J Landin and was patented. The US Patent # is 482312. The device was manufactured and sold as the "Rapid Computer Adding Machine" from 1893.

The Comptator name was used for an improved version built by Schubert & Salzer of Chemnitz Germany from 1909. Production was transferred to Hans Sabielny of Dresden from 1922. Sabielny was later involved in the manufacture of Facit calculators in Dusseldorf during the 1950s and 60s.

Fine . . . . . . $100.00        SOLD!!

A. Lietz Merchants / Bankers Slide Rule  This rule dates from before the WWII. It looks to have never been used. The case is fine. The catalog / manual is nice, and this rule and its scales are described inside.

Good+  . . . . .$75.00      SOLD!!

Castell 63/22 Addiator Slide Rule   This 6" sliderule is set up with a slide rule on one side, and an addiator, or adding machine on the other. It even has the pointer for the adding machine. Complete w/ cloth like case. It is a very hard to find combination rule / adder.   Nice!!

Fine . . . . .$95.00      SOLD!!

Easterly Rafter Calculating Slide Rule   This unusual rule to help the carpenter figure his roof cuts hails from Healdsburg CA. It was copyrighted in the 1940's.   Different & Nice!!

Fine . . . . .$55.00       SOLD!!

Sun Hemmi #153 Slide Rule This is a nice rule in like new condition!!

Fine . . . . .$75.00       SOLD!!

Consul the Educated Monkey Calculator   This is a real, early, and original model of this great idea. It is not one of the new fake knock-offs. These came out about the time of the Scopes trial back near the turn of the century in TN in the seminal case pitting creationists against teaching evolution in our schools. I wouldn't doubt that this idea was introduced as a tongue in cheek way to drive the creationists crazy.Think of it, a monkey teaching kids how to add, subtract, or multiply.Blasphemy. Maybe not though, if todays wingnuts get one more appointment to the Supreme Court who knows what tomorrows kids are going to be taught in schools.Who you voting for? 
Nice!!

Fine . . . . .$125.00       SOLD!

J. Long London Proof Slide Rule  An interesting slide rule for calculations having to do with determining the alcohol content, or proof, of liquids like wine of hard liquors or spirits. Such rules are oftentimes found in Sykes Hydrometer sets. The maker name J. Long, and location, 20 Little Tower Street London are on the top rail. It is in very nice condition.

Fine. . . . .120.00         SOLD!!

Sun Hemi Electrical Engineering 256 Slide Rule This is a nice looking sliderule!!

Fine . . . . .$95.00       SOLD!!

Sans Streiffe #311 Duplex Slide Rule This is a nice looking sliderule in its case w/ original box & instructions!!

Fine . . . . .$65.00      SOLD!

September 2, 1851 Patent Samuel Young Interest Calculator  The patent holder of this unusual slide rule like interest calculator was named Samuel Young and he hailed from Eaton Ohio. The patent number is 8329 and the patent can be looked up using Google. It is a rare and early piece that there is little reference to or information about on the internet. The Smithsonian has the patent model for it, and has a pretty extensive write-up on the patentee. That page can be seen here  http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_690825&repo=DPLA

In reading his Bio there it seems he had two other patents for other calculation devices with this one being the middle one.   The overall condition is pretty nice noting that one of the slides is damaged. The patent lays out how it is operated and what the scales are for and how to use it.  From my reading it seems different bars represent days, weeks, months and so forth. Different and an opportunity not to be missed.

Good . . . . . $ SOLD!

Geotec 341 3012 Versalog Slide Rule   This rule is mint and still sealed in the plastic. Geotec was a Canadian outfit and their rules were made by Sun Hemmi.   Nice!!

Fine . . . . .$95.00       SOLD!!

Loga Modell 6400 Topo Circular Slide Rule This is a nice looking sliderule with its leather pouch.

Good + . . . . .$145.00 SOLD!

Pickett N4 Aluminum Slide Rule   This is a very nice rule in its original box with case and instructions. It displays no signs of use. Very unusual and very nice!!

Fine . . . . .$75.00       SOLD!!

20" Dietzgen #1762-P Mannheim Slide Rule This is a nice looking sliderule in its original case. The rule has a bit of a sway to it, but it still slides easily.

Good + . . . . .$75.00       SOLD!! 

Halden Calculex Circular Slide Rule / Calculator  The condition is excellent and it is complete with its instruction booklet and flip top aluminum case. It is English and this one is only marked with the original makers name. This type calculator was offered by several different distributers like Dietzgen, and K & E and others back around the turn of the century. A piece of calculation  history.

Fine  . . . . .$150.00       SOLD!!

Odelco / Sun Hemmi 269 Slide Rule NOS. A Japanese Sun Hemmi product marked Odelco for the Philippine distributer.   A hard to find and nice rule!!

Fine . . . . . $75.00      SOLD!!

Dietzgen 3193 Slide Rule w/ Magnifier & Humped Case  This is an unusual variant with a fitted magnifier and its original nice condition humped leather case to allow for that. The overall condition of the rule itself is nice.  I believe it is the equivalent of a K & E 4053-3. It is marked w/ 2 patent dates. August 9 1904, and June 28 1898. Nice!!

Good + . . . . . $50.00   SOLD!!

Castell Addiator w/ Slide Rule   Adding machine w/ stylus on one side, and a slide rule attached to the other side. Nice noting small chip on bottom right of rule. I see no number on the rule, but believe it is a Faber-Castell 67/54 RB Darmstadt/Addiator.

 Good + . . . . . $50.00     SOLD!!

The Equationor or Universal Calculator Patented & Copyrighted by Walter Hart The Equationor circular slide rule / calculator patented & copyrighted by Walter Hart is one of the rarest and most unusual slide rules ever produced. There are no other examples, other than this one, to be found or viewed with internet searches. There is one article by Conrad Schure about the Hart Equationor in a 1992 issue of  Oughtred Society's publication. Also the Library of Congress has a copy of the 32 page instruction booklet that anyone can download for free as a PDF. Beyond that there are just resellers trying to market copies of the instructions that can be had for free further down the page.

The face of the calculator has a wealth of information printed on it. In the left top corner are the 2 copyright dates from 1888, and 1889. In the left corner are patents from July 31 1888, and April 29 1890. The 1888 patent # is 387,070 and is titled Sliding Logarithmic Scale. It is viewable with a Google search. The second patent from April 29th 1890 closely resembles the calculator as it exists, right down to the sliding magnifier. That patent # is 426,444 and is titled Sliding Calculating Scale. It too comes up with a Google search.

The simple and ingenious logo Walter Hart came up with to market his calculating slide rule, that took 32 pages to explain how to use, was "Arithmetic Without Figuring". Simple Genius.

The condition of this Hart Equationor is exceptional. Many circular slide rules have a problem with the scales peeling, chipping, or otherwise deteriorating. Not so here. There is a fine alligatoring texture to the surface that looks to be factory and not damage. The face is near flawless w/ one small dent chip. The magnifier is very nice. The box is original and w/o lid.A super nice and rare piece of calculation history that will display well and be a great addition to the old office, slide rule, or calculation related collection!!  Enjoy.

Fine . . . . . $6295.00     SOLD!!

"The Universal Adder" Patented July 15th 1890 Adding Machine George B. Fowler of Chicago, Illinois, was granted his first patent (US39222) On 14th July, 1863, for a similar adding machine. The patent model of that sliding bar adder is viewable online.

In 1890 Fowler received a second patent (US432266) for an improved version of his adder that was renamed The Universal Adding Machine. It was sold by the Universal Adding Machine Co., NY, NY, for $8. It was an improvement with essentially the same appearance as his earlier patent. Both patents can be found online.

This sliding bar adder, according to the info on the front case, was patented in England, France, Germany, and Canada as well as the US. It was a well done and interesting design, with a window in the back of the unit to view the current result. There is a site that gives a good history and instructions on how to operate and view the results. That can be found searching this

arquivo.fluxo.info/conteudo/history-computer.com/history-computer.com/CalculatingTools/Gadgets/Fowler.html

The body has an ever so slight warp making sliding the bottom two scales marked millions a bit harder to move. Overall the condition is very nice with just minor losses to the finish on the front. There is also a paper label and instructions with some losses on the backside as can be seen in the pictures.

It is interesting to note that the only other example of a "Universal Adding Machine" of the same design and with the same finish as this one that Google knows about was one I sold over 20 years ago and can be viewed on my past sales website. www.antiqbuyer.com/past-sale-archives/scientific/sliderules-1.htm  I would think that would make this a pretty rare piece of calculation history.

Fine. . . . . $795.00          SOLD!!

Pilot Balloon Slide Rule MK IV A Pilot Balloon slide rules were made for the British Meteorological Office by different makers.

The Pilot Balloon slide rule is used to convert the observed azimuth and elevation readings into wind velocity and direction records. The use of slide rules and plotting boards was rendered obsolete with the wide spread adoption of computers and programs to do the calculations, as well as the decline in the use of optical pilot balloon theodolites.

A nice piece of calculation history that will display well and be a great addition to the old office or calculation related collection!!

Good  . . . . . $225.00      SOLD!!

Alpina Adder / Calculator Here is an rare Alpina Adder / Calculator in its hard hinged case pictured. The Alpina Calculator is a hard to find calculator / adding machine, especially in this nice condition. It is in very nice original condition and the finishes are near perfect noting one small rub on the backside. There is also an empty screw hole on one end. It does not affect the function, more like to help hold the outer housing in place

These small German made calculating machines were only produced for a couple years in the 1960s and less than 4K were made / sold. I looked pretty carefully, and do not see any serial number.

It seems, and for good reason, the Curta calculator was far more popular, not to mention easier to operate, and the Alpina just could not compete. A great addition to the calculation / scientific collection.

Good + . . . . . $1295.00         SOLD!!

Dempster Rota Rule Slide Rule Model AA w/ Magnifier, Case, Manual & Box A rare and hard to find circular rule especially in this nice condition. The serial # is 1293 and it dates from the 1930s. I see no issues other than the outer box having some scuffs. A great addition to the collection.

Good + . . . . . $695.00        SOLD!!

Eastman Kodak X-Ray Exposure Slide Rule     There is a copyright date of 1919 on the back side of this unusual double slide slide rule. There are also directions for use here that are pretty vague and lead one to wonder how many people they were overdosing when they were performing this new technology on patients way back when. One of the two slides that move has scales on both sides talking about the spark gap and tube distance. THe other is for the type of film used.  The fixed scale on one side is all about different body parts and on the other is exposure time in seconds ranging from 1/16th to 64. 

There is a slight bend in the body of this (probably due to overexposure), but everything still moves and slides as it should. It measures 2.5 x 5". The outer case as seen in the picture is a bit ratty, but the rule itself is pretty nice, noting one minor tight crack in the bottom right corner in the greenish cover.  A rare an unusual piece of medical or X-Ray related memorabilia.

Good . . . . .$195.00       SOLD

Pickett Model # 6-T Statistical Quality Control Slide Rule    Overall this rule is in very good condition. Special use slide rules from any company are much more difficult to find, and this one aimed at statistical analysis is no exception. I count 28 scales to keep you occupied, and I wish I could tell you the significance of them, or why this is special for statisticians but I cannot. I do know that only a few have been offered at the internet auction, and that new in the box I have seen them for a lot more money than this one.

Good . . . . .  SOLD

The Smallwood Calculator  The adding machine itself is near mint, as is the walnut base it is set into. Marcia Palmer did lightly put her name in the top rail. The small wooden original stylus is present. The protective case, which is a triangular cardboard box, has one end popped loose, and the patent date is on the front of it in small gold lettering and looks to be Feb. 23, 1---, with the last numbers being unreadable. These interesting and desirable adders were produced by different manufacturers over the years. This example, The Smallwood,  from Oakland, CA,  is one of the harder ones to find, and even more so in this condition.

Good . . . . .  SOLD

Castell / Faber #2/83 Novo Duplex Slide Rule   This rule is 15" long and is one of the most sought after and popular of all rules put out by this company. There are at least 30 scales, and a host of color schemes to help you keep things figured out. If you need help with them the super condition 30 page manual is here as well. There is also a conversion chart and ruler in the bottom of the case. The rule is in excellent condition, and has no problems with any aspect of it. The case is cracked across the bottom. A rare rule, and a welcome addition to the hoard.

Good . . . . .  SOLD

Otis King Model A #6992 Circular Telescoping Slide Rule / Calculator   Here is an early version of this English favorite, and it is in super condition. There are two scales #423 & 414, which are both in great condition, with no peeling or other problems. These earlier models were done in white on black for the scales to give them more contrast. I have had later models that were done reverse of this. This one also has a small ring at the top which later versions do not have as well. Lastly there is the calfskin slip cover that has the name still visible, but it is in a very fragile state, and both the top and bottom are missing.

Good . . . . . SOLD

Fullers Computing Telegraph Calculator w/  Palmers Computing Scales  It is no wonder that America was the leading power during the industrial revolution. They had people designing, patenting, and introducing calculation devices like this one. This unusual calculation device  was light years ahead of the competition and probably led to the  introduction of many other new products and ideas. The Palmer scale says it was first patented in the 1840's, and I guess after Mr. Fuller improved on it he included it with his own version of a circular slide rule. Luckily he had the foresight to include with it a booklet of operating instructions   The opening blurb in the instructions claims this is "The Great Master Key Rule by Which All Problems are Instantly Solved.  I am not really sure if it could have solved Bernie Madolf's problems. 

The entire package is in very nice condition, and they are rarely seen in this nice condition any more.

Excellent  . . . . .$795.00        SOLD!

Poor's Line of Position Navigation Computer  This is a rare and interesting navigation related calculator. There are a couple of references on Google about it lamenting the fact that so few are known, and that only pictures of it can be found in a book by the inventor Charles Poor.  The face is marked Pat applied for, and it is not known if one was ever granted

This calculator is in like new condition with it original box. The box has seen better days and the corners are torn and weak. The instrument measures approx 12" dia. and the base is cast aluminum. The instructions are present and in very nice condition. It says it is a mechanical navigator for use on ships or aircraft. At the bottom in addition to the inventor designers name, the name T.S. & J. D. Negus is given as the seller. This was a well known outfit that dealt in all manner of navigational and nautical related devices.

Good+  . . . . $1295.00        SOLD!

Loga 30 R C Circular Slide Rule / Calculating Disc Also marked USTER - SCHWEIZ. This Swiss made two-sided circular slide rule does it all. These came in different models, and the 30 R C does all sorts of Business related weight & measure conversions. It also does money conversion. It looks like British monetary units are on the outside rings on one side.

The instrument is 5 inches across. The case is 6 inches across. This is beautifully made and in Fine condition. It comes with the original, zippered leather pouch and a booklet of instructions. Also in Very Good condition.

Fine . . . . . . $60.00        SOLD!!

Stanley Fuller / London England / Spiral Calculator / Sliderule This Stanley Fullers Spiral Calculator / Slide rule is in nice condition. This is an example of a calculator that is getting harder and harder to find. They were first introduced in the 1880's. At first they were made and offered by Stanley of London a well known firm that also made the famous Thatcher calculator, and other surveying or engineering related instruments. Later on K & E bought the rights and offered them until the end of production in the early 70's.

The serial #'s numbers on the brass scale are 6900 -37. I believe that indicates it was made in 1937. It has the brass external mount feature so that the slide rule can mount  for use on the outside of the box, but the mounting bracket itself is missing. The box is pretty nice, and  is mahogany. It has a finger joint design in the corners. It has a nice green Stanley label inside the top. It is in overall good condition noting the remnants of another label or sticker on the outside top.

The inner scales are very nice. It has the typical scales and charts found on these type one model calculators, and the outer scale has the typical light brown tint to it.  The scales, both in and out are in very nice condition noting just a few minor dings. The short pointer is marked Fuller Calculator, and Made in England. The long cursor in addition to having the date and serial number is graduated along one edge. A nice piece in outstanding condition.

Good + . . . . . $300 - $500         SOLD!! 

Fuller Spiral Slide Rule / Calculator   The condition of this Fuller slide rule is like new / mint and came from the original owner. These slide rules were produced in England by the W. F. Stanley Co. The Fuller Circular slide rule was first developed and introduced in the 1870's.

The serial # on this unusual circular drum style slide rule is 13643 /70 dating it from 1970 and very close to the end of their production nearly 100 years later.  It has been suggested in online write-ups that no more than 14,000 were made during their entire production span. Production of this slide rule was very limited by this period and this example is one of the last few hundred made when production ceased in the early 1970's.   There were several different models produced and offered over the years. This style would be referred to as the type 1. Over the course of production different US companies like K & E and Dietzgen offered this rule as part of their line. This one is just marked Stanley / England.

The mahogany box is like new. The original instructions are included. The top and bottom of the rule are Bakelite and chip, crack or damage free. The brass rod to mount it to the box for convenient use is present. This rule is essentially new and unused. It will make for a great addition and marks the end of an era with the introduction of electronic calculators which made the obsolete and yet created a fine collectible.  A classic!!

Fine +  . . . . . SOLD!

Fuller Spiral Calculator by Stanley   This is an earlier model than the one above. It does not have the external mount like the one above as the earliest models did not offer that feature. The number on the brass scale is 109 and that number is repeated on the base of the scale. I assume that is the serial # which would date this pretty early in the scheme of things.   There are no tears to the scales and they are pretty nice on both the inner and outer drum.  There is some very minor spotting to the scales, but the overall condition is very nice. There is a tight crack in the box top as can be seen, and there is an early repair to it that adds a degree of character to this interesting and early calculator.  A nice piece in overall very nice condition.

Good . . . . . SOLD

Stanley Fuller Spiral Calculator / Sliderule This is a super nice condition example. The numbers on the brass scale are 5968 -28.  I am not sure where that would put this date wise, but it is an later model with the brass mount feature that the slide rule can mount to for use. There is a hairline crack as can be seen in one of the pics in the wood frame, but it is just a line in the wood. There is no damage, movement, or looseness. The instructions are included as well. The John Davies label inside the lid must be from the distributer, who specialized in Mining supplies as well as surveying instruments and more. That label mentions 1933, but it is unclear in what regard. A nice piece in outstanding condition.

Excellent . . . . . SOLD!

Stanley Type 2 Fuller Spiral Calculator / Sliderule This is a  nice condition example of a very hard to find variation of a Fuller / Stanley slide rule calculator. The numbers on the brass scale are 5836 -27.  I believe that would date it from 1927. The finger joint mahogany wooden box has a Stanley paper label in the top, as well as a tag, from I assume, the factory it was being used in. I am not sure what the name of that company was, but the tag says it is from the aircraft division and 54 over 14690. The box is OK noting one latch is missing, and there are some paint spots on the top. It does have the mounting bracket on the end of the box, and the proper bracket to mount this calculator is in the box.

As for the rule itself, the scales are pretty nice with just a few small dings here and the typical yellowing the paper scales develop. There is a hairline crack in the top wooden donut as can be seen in one of the pics. It is just a line in the wood,  there is no damage, movement, or looseness.  There is also some minor staining, dirt and chipping of the paper at the top and bottom of the outer cylinder. The short pointer is marked Fuller Calculator with Scales of Sines & Logs Made in England. This is what makes this model so unusual.  One can see the difference immediately on the inner scale as there are none of the typical tables or equations usually seen. This inner scale is made up of 2 sets of scales from top to bottom. A rare piece in nice condition.

Good + . . . . . SOLD! 

Gordon's Addometer / Calculator  This is an interesting, early, and rare adder. It is marked on the inside ring "Gordon's Addometer / Patent Applied For". The circular body is made of Gutta Percha type plastic material. There is a  crack in it from shrinkage. It is stable and the calculating rings can still be rotated.  The cover is a nickel plated non- magnetic material like brass. I believe unusual circular adder dates from the last quarter of the 19th century, and perhaps as late as the turn of the century.

A Google search turns up just one reference for the Gordon Addometer from a German site listing the name but there is no patent info or other info at that site. Most Addometers are much later than this and there is plenty of info on those. A Google Patent search turns up nothing for Gordon Addometer. I tried for over an hour to find something similar and  I looked at a lot of other devices called addometers and perhaps the reason is that this design was an infringement and was never granted a Patent. I am not sure.

I do have a bit more information from the owner. This is one of just 4 of these that was found in an attic in New York near the New Jersey border about 20 years ago. The parties in that original transaction surmised that the inventor had just a few of these made as pre-promotional examples, but that something then transpired that stopped the patent process and any further manufacture or development. When these were found two were sold privately, and one was placed in the German Breker Technology Auction, where it sold in the 4K range. This is the last one that remains, and when this one goes that is the end of them.

Opportunity knocks.

Good . . . . .$3250.00         SOLD

Loga Drum Calculator / Sliderule   This large cylindrical slide rule / calculator is a Swiss idea that was produced just after the turn of the century up until about 1920. They came in a few different configurations and with different bases or covers. This ones instructions are missing, but the rule is otherwise pretty nice. The cover has a couple dents in it, but is OK.  It measures approx 18" long and I believe is the largest model offered.

Good+  . . . . .$795.00        SOLD!

Loga Drum Calculator / Sliderule   This large cylindrical slide rule / calculator is a Swiss idea that was produced just after the turn of the century up until about 1920. They came in a few different configurations and with different bases or covers. Note in the other pics how it is able to swing up to be like a Fuller. This one has a set of instructions on the base and a second revolving reference / information area as seen in the bottom pic. 

Good+  . . . . .$1295.00        SOLD!

The Locke Adder This unusual sliding bar adder was patented in Kensett Iowa in 1904. This is kind of late in the scheme of things as far as the design of calculators and adders was progressing, and probably helps explain its relative scarcity as it probably was not very popular and seemed dated to potential buyers it was offered to. This example is in Good- condition with some paint loss to the body. The slides all function as they should. An interesting piece that clearly demonstrates just how far we have come.

Good . . . . .$395.00         SOLD

The Universal Adder Patented July 15th 1890  This unusual sliding bar adder according to the info on the front case was patented in England France Germany and Canada as well as the US on the date found on the left side of the case. It was a well done and interesting design, with a window in the back of the unit to view the current result. The body is made of some sort o early plastic / gutta perch a type material, and it has warped somewhat over the years, making sliding some of the scales a bit difficult to achieve. Overall the condition is very nice otherwise. There is also remains of a label and instructions on the back side as can be seen in the second picture.

Good . . . . .$695.00         SOLD

"Simplicitas" Addizonartrice  Despite its name "Simplicitas" this adder is anything but simple and is as complicated an adding machine as I have ever seen before. And I should note, I have never seen this one before,  and can find no mention of it running searches on the internet or visiting several sites I know of that cover these pieces.  

As can be seen it has 9 dials mounted on a nicely finished wooden board. It measures approx 22" long overall. It comes in the original fabric / faux leatherette case. Note there is one small ding in the top right corner of the back board. Overall it is very nice though. It has its original bone or ivory pointer as well.

The layout, with a single dial to the left, and then a group of 3, and then a group of 5 with 2 above 3, must mean something, to someone, but is beyond my reasoning capabilities. On top of that, each dial has 3 scales. 1-9 on the outside,  then another 2 different scales under the wheel with one going into at least double digits. All of the dials are independent of each other and do not carry from one to the next. We need the instruction manual for this one, or you can spend a few minutes figuring it out.

Good . . . . .$1495.00         SOLD

Fowler Type H Calculator  Fowler is a well known English name in circular sliderules / calculators. This Fowler pocket watch style calculator is in super like new condition. The original instructions are nice and included. The outer box is tattered. There is a small piece of plastic that was used as a magnifier. A very nice example.

Good . . . . .$295.00        SOLD

The Hart Calculator or Equationor  I can barely use some of the simple examples of these calculating marvels from an earlier time that I have had,  and I routinely use to flunk most of the math courses that I had to take in school,  but there must be a latent gene that drives the quest as I cannot seem to stop buying these sort of things. Vintage calculators, slide rules, and other calculation devices are still available and it is always fun to find a different one while on the hunt.

SOLD






Millionaire Calculator - Calculating Machine  The idea for the Millionaire Calculator design was first patented in 1892 by Otto Steiger of Munich Germany. Steiger's design was later improved upon by Hans W. Egli of Zurich Switzerland. The tag on the left side of this example has the Egli name. This example is also marked with two US patent dates from 1895. Production of the Millionaire Calculator began in 1893 and ended in 1935. A total of about five thousand were manufactured. From the serial # 1633 we can assume this example dates from just after the turn of the century. There is an online registry for these calculating machines found at John Wolff's Web Museum / Register of Millionaire Calculators. He has a number of examples listed, (over 200) and many examples are pictured there.

The Millionaire calculator was the first commercially successful mechanical calculator that could perform direct multiplication. Other calculating machines of the period were adding machines that accomplished multiplication by preforming addition calcs over and over. A much slower process. This aspect of the design is explained in great detail at the www.history-computer.com site. The tag on the left indicates this example was sold here in the US. The tag reads W. A. Morschhauser Sole Agent Madison Ave New York City. I read these machines retailed for between $475.00 and $1100.00 at the time of manufacture. A huge sum for the time.

Note the exceptional condition. This Antique Millionaire Calculator shows very little signs of use and mainly just storage scuffs. This is the less common metal case model. The Millionaire Calculator also came in wooden cases. Overall It is in very nice condition with typical scratches. On the interior, the areas under the swinging arms still have nearly all of the original black finish. Many examples you can view online show considerable wear in these areas. It is a large and heavy machine. The measurements are approx. 7 1/4" x 25 5/8" x 11 1/4". It weighs close to 70 lbs. and is the 8 column model. They could be had in larger sizes with up to 12 columns. A rare opportunity to own a piece of calculation history. Recommended.  

Fine . . . . . $2450.00        SOLD!!

The Calcumeter    This is the smallest 5 place model of this patented adder. These are 10 times harder to find than the larger models. It is in very nice condition noting one bent corner.

Good . . . . .$195.00         SOLD

Percentage Calculator   These are usually associated with stores where the operator was trying to figure out his profit or discount to be given. This one is Tole Painted and probably dates from just after the turn of the century from the look of it.

Good+ . . . . .$125.00         SOLD

1st Model Webb Patent Adder  The Webb Patent Adding Machine came in 2 different models with this the brass version mounted on a mahogany board the first and earliest model. Later versions were brass that was nickel plated.  This is properly marked with the patent date, and the serial #.

Good . . . . .$895.00         SOLD

1st Model Comptometer / Adding Machine  The Comptometer was a huge success and the later models are considered quite common. These earlier version in the wooden case are quite hard to find, and entire websites have been set up to provide, and gather information about them. There is a site where you can register early ones like this, and just a fraction of those made have been documented.  This is a nice one and an opportunity not to be missed.

Good . . . . .$2495.00          SOLD

"Small" Pocket Calculator / Slide Rule  This unusual  slide rule / calculator was patented, but there was only one production run and few of those were sold until a stash of them was found back in the 70's or early 80's. That small stash was qu9ckly gobbled up and they are rarely seen now that the limited supply has been distributed. This is a nice one.

Good +  . . . . .$695.00         SOLD

The Rapid" Calculator / Adder This is a very complicated and precision made adder / calculator. I have only had a few over the last 20 years. I know firsthand as my last one had a small problem carrying over, and after I got inside, and started taking it apart, I regretted it. I am sure I voided the warranty on that one. This example is near mint and operates just fine. Personally though, I would buy an electronic hand held for a 1.00 and leave this one for display.

Good+  . . . . .$295.00        SOLD!

Marchant Calculator   The Marchant Calculator company was based in Oakland Ca and began operation near the turn of the century with their non-electric pin wheel design calculators that are well known and highly collectible. The Marchant in the Click for Pic is the black one on the right. The condition is excellent. The label on the back lists off all the different Patents that were designed to protect it, but Marchant is but one of the names associated with this design, so they were either selling the rights, or they were in production for a long enough time for copies to be made.  As the technology grew they moved on to electric models. This earlier model is in very nice condition and seems to be fully operational.       

Good+  . . . . .$195.00        SOLD!

Walther Calculator   The German Walther company was best known for manufacturing weapons and pistols. In 1926 they branched out to include a line of calculators. The condition of this example is very nice looking but it is jammed up.

Good  . . . . .$225.00        SOLD!

"The Jeffers" Calculator   This is a very unusual and complex Agricultural related calculator. It is in super near unused condition. It is a wooden box that opens to reveal the calculator inside. It measures approx 5 x7". Inside the front door on the left side are the instructions and explanation of what you would need this for and how to use it. Basically it is for computing just the right mixtures of feed and ingredients for livestock nutrition derived from different ratios of mixtures of different grains and meals. Sound complicated, just try using it to see how tedious it is.   I think that pretty much explains the condition, as I would be willing to bet most of the livestock got whatever was available in the way of leftovers from the corn crop or other grain crops, and that was pretty much it.  There must be 60-70 different printed slides stored on the left which you would put into the holders on the right, and start computing the ratios, cost, weight and so forth. I have a feeling this did not go over real big with the typical country farmer, and back then, when the farms were pretty much family owned something like this was not really needed or desired. Perhaps today, and perhaps the Chinese should be using something like it before they add to much of whatever to the next batch of dog food, or your food.

I looked it over, and tried it out, and I can confirm it is pretty much non understandable. That is what makes it a great collectible in the field of calculation.        

Excellent . . . . .$195.00         SOLD!!

"The Locke Adder" This unusual sliding bar adder / calculator was patented in Kensett Iowa in 1901. These unusual adding machines can be found marked with a second patent date from 1905 as well, and so I assume we can call this the first model.

This adder seems kind simplistic in the scheme of things as the design of calculators and adders had been progressing rapidly and was well advanced past this design by 1900, but I guess they had not heard that in outer Iowa and about what was going on in the rest of the world. This probably helps explain its relative scarcity as it probably was not very popular outside of that area and seemed dated to potential buyers elsewhere it was offered to. That old world view probably explains some of the goings on in Iowa today as well.

This example is in excellent condition and show little signs of wear or tear. The main body is pressed steel in a copper flash finish, and the sliding adding bars have nearly all of their original paint. The slides all function as they should. An interesting piece that clearly demonstrates just how far the field of calculation has come and how Iowa fits into the picture.

Good . . . . .$495.00        SOLD!!

1st Model Wooden Case "ShoeBox" Comptometer Adder / Calculator   The serial # on this 1st model Comptometer is 2190. It is stamped into the metal cover over the counter area near the middle.   These early wooden case comptometers were offered beginning in 1887 and were sold through 1903. During that period a little over 6,000 were produced. After that the machine was cased in a metal housing. The basic idea remained pretty much the same while going through a number of minor cosmetic changes over the years.

There is a very informative and worthwhile site that details the history, design, operation, and other info about these machines on the internet. It can be found at www2.cruzio.com . This 1st Model Comptometer is listed there along with the other known wood case examples that have turned up. Known wood case models number under 100 according to this chart. This example came from at descendant of the original inventor / maker whose name was Felt.

All of the main keys seem to operate as they should. There are none that are stuck. By manipulating the key strokes I can get it to zero out, but the black knob on the side which is supposed to zero it does not turn or operate. The wooden return lever moves but does not seem to do anything.   In general when pushing the main keys it seems to carry over pretty good, except for the last column which seems to skip or overcount at times. The main parts of the case are in Mahogany and the base appears to be a softwood like pine. The outer case is in very nice condition and looks to be original finish. The bottom cover door is missing.  A new panel could easily be fabricated if wanted.  These wooden case comptometers only appear on the market occasionally. Some have been known to sell in the $4000 - $6000 range, and we have this one priced to reflect the minor operational  issues mentioned above. A rare piece that will be a welcome addition to the advanced collection of early American calculation devices

Good   . . . . .$1295.00        SOLD!!

Three Different Webb Adder / Calculators   The Webb adder was first patented near the turn of the century. The first models were brass and mounted on a wooden board. The next generation looked like the one on the left. After that other versions appeared such as the Herring Calculator in the middle. These were designed to calculator / add weights  or loads of rail cars. It is a hard to find variation of this calculator. Finally on the right we have what has become the norm in our lives, an unmarked knockoff that was offered at the time as the real thing. . Much like most of the name brand stuff you see at flea markets today, unless of course the parent company moved production there, then it is called progress or Global something. It does not add up. Anyway, all three of these are pretty nice, and all seem to operate. Fill out the collection.

Left ..... Good+  . . . .$295.00          SOLD!

Middle ..... Good+   . . . . .$395.00        SOLD!

Right ..... Good+  . . . . .$225.00         SOLD!




Comptator Calculator / Adder   These two are basically the same with different makers names. The left one is German and has location info on the front.

"The Rapid Computer"  Calculator / Adder   The writing on this one says it was patented in the US in 1892. It says it hails from Benton Harbor MI. It seems to work just fine.  Very Nice!!

Left ...... Comptator ..... Excellent  .....$95.00        SOLD!

Right .... The Rapid Computer .....Excellent  .....$75.00 SOLD!




Odhner Style Mechanical Calculator   This mechanical calculator is similar in design and function to the American Marchant mechanical calculators made in Oakland CA around the beginning of the 20th century. The name on this example looks to be Russian or some other Cyrillic language and it may be an Odhner which have similar features like the wingnut zeroing knobs this one sports. Odhner calculators were first made in Russia in the 1870's after which production was moved to Sweden. There are many other brands or makes of mechanical calculators similar to this as it was a popular design that was produced worldwide well into the 20th century. It is functional and not bound up or jammed. The overall condition is very nice!!

Fine  . . . . . .$95.00          SOLD!!

Comptometer Mechanical Calculator   This mechanical Comptometer calculator was cosmetically restored and sold by This Olde Office an outfit that dealt in Antique office equipment that was based here in CA back in the 90's. The owner bought old used office equipment and repainted and "restored" them creating antiques for the decorating crowd not only in CA but worldwide. It looks great, but this vibrant color is not one used buy the actual company. Interesting.

Fine  . . . . . .$15.00         SOLD!!

Burroughs Glass Side Adding Machine / Calculator    Without a doubt the Burroughs Adding Machine is one of the most graphic if not heaviest of all 10 key adders / calculators ever made. This one looks great with its see through glass sides so one could / can see how the mechanism worked when operated. The stand is original and nice.  Quite impressive!   It was restored / repainted and sold by This Olde Office which was located here in CA back in the 90's. It comes complete with a framed letter of authenticity which authoritatively and definitively guarantees that this is in fact an adding machine. Thor did nice work.  A great reminder of what it use to be like. Nice!!

Good +  . . . . . .$195.00       SOLD!!

A. Burkhardt Type A Arithmometer   This early stepped drum adder / calculator is in nice overall condition. From its features and low # 72 serial number It would be a first model called the Model A produced in the 1870's. The basic design of this style calculator was first designed over 100 years earlier and there are numerous bios on the inventors and histories of this style stepped drum calculator called and Arithmometer that can be found on the internet. I read the original design was developed by Liebniz. Mathias Hahn & Thomas de Colmar created versions of their own design after Liebniz. A. Burkhardt was German and is credited with being the first in Germany to produce them. Over the years he produced several different models with this style being the earliest. This same basic design calculator can be found with several other names from different locals as well.

This example wants to work, but does not work properly or consistently. I believe it is just an adjustment.  I see do damage, bent pins, missing parts or the like on the underside. It will work for small amounts, and sometimes for larger ones, but then will hang up. It zeros out and the carriage moves OK. Also the division function works - - - - sometimes. On the left the small framed slate board is missing over the open hole. There are also 2 of the miniature thumbscrews missing from the first two digits on the upper far left. You can see this in the pics.   

A rare and unusual calculating machine, especially being the early model with such a low serial number. Worthy of inclusion in any collection with a focus on Office antiques, calculation, or technology advancement. 

Good   . . . . .$1995.00        SOLD!!

The Calculus Calculator   This is a calculator I have never seen or had before. This unusual dial / drum type calculator claims it was patented on January 22nd 1907. It also has the maker name James J. Hinde Co. of Cleveland O. on the side. The catchy logo / phrase under the name reads "Proves as it Calculates".

I could not find the patent with Google Patent Search. I did find an ad in a lumberman's magazine touting it usefulness for use in that field or trade. A few other references to this calculator can be found on the internet, but scant examples are pictured or discussed. The internet site that deals with office antiques like pencil sharpeners, staplers, and the like also has an ad for one of these showing  the user sitting in front of a larger and what looks to be ganged together unit. The dimensions of  this stand alone Calculus Calculator unit are 4 x 5 x 18". Note the folding leg / stand that angles it for easy use.

It looks as if it is meant to calculate the price of multiple units. The rotating drum is broken down into 1/4 increments starting at one and going up to 80, or maybe 100. The columns are the top number added to itself over and over again in different ways   A lot of it makes no sense to me, and I have provided numerous pics below to help you determine just what it is capable of doing.   Different!!

Good +. . . . . $795.00        SOLD!

1st Model Webb Adder / Calculator   The Webb Adder was first patented near the turn of the century and the first model had a brass face and mahogany back as seen here. They were also marked with a serial # and this one is # A-5664. The next generation were all metal and nickel plated like the ones just below.  The patina on this one is great, and it seems to operate just fine and does carry. The earlier versions are becoming very difficult to find, hardly ever offered for sale and this is a great looking specimen. Very Nice!!

Good+  . . . . .$695.00        SOLD!

1st Model Wooden Case / Shoe Box Style Comptometer w/ Fractional Keys  The serial # on this 1st model Comptometer w/ fractional keys is 5539. It is stamped into the metal cover over the counter area between the 4th and 5th window. These early 1st model wooden case comptometers were offered beginning in 1887 and were sold through 1903. During that period a little over 6,000 were produced. After that the machine was cased in a metal housing. The basic idea remained pretty much the same while going through a number of minor cosmetic changes over the years.

There is a very informative and worthwhile site that details the history, design, operation, and other info about these machines on the internet. It can be found at www2.cruzio.com . This 1st Model Comptometer is not listed there with the other known wood case examples that have turned up. Known wood case models number under 100 according to this chart and just a couple have fractional keys.Doing the math, it can be assumed that one, very few comptometers were made with fractional keys, and 2, that even fewer have survived.

All of the main keys seem to operate as they should. There are none that are stuck. By manipulating the key strokes I can get it to zero out. Beyond that it is not tested.  The main parts of the case are in Mahogany with its original crusty finish. The base appears to be a softwood like pine and the bottom door is present.

These wooden case comptometers only appear on the market occasionally. Some have been known to sell in the $4000 - $6000 range. This 1st model fractional key comptometer is rare piece that will be a welcome addition to the advanced collection of early American calculation devices. Very Nice!!

Good +  . . . . .$4500.00        SOLD!

Class Room / Teaching
Slide Rules

This.

Pickett N500-ES 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N500-ES Log Log rule and has 22 scales. It dates from the 1960's.   Nice!!

Fine . . . . . $350.00

Pickett N1010-ES Trig 7' Classroom Teaching Aid Slide Rule  The condition of this 7' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. I do not think it was ever used. Nice!!

Fine . . . . . $350.00      SOLD!!

Pickett N4-ES 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is exceptional. It is model # N4-ES Vector Type Log Log rule a more complex model than the more typical classroom size N-1010 you see offered all the time. It has 34 scales. It dates from around the 1960's and just before handheld electronic calculators hit the market big time. Nice!!

Fine . . . . . $350.00          SOLD!!

Pickett N1010-ES Trig 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. I do not think it was ever used. Nice!!

Fine . . . . . $325.00      SOLD!!

Pickett N1010-ES Trig 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. I do not think it was ever used. Nice!!

Fine . . . . . $325.00     SOLD!!

Pickett N1010-ES Trig 4' Classroom Teaching Aid Slide Rule  The condition of this 4' teaching aid sliderule is very nice. It is model # N01010-ES Trig rule. It dates from the 1960's or 70's. One ding as pictured on the back side. Nice!!

Fine . . . . . $375.00      SOLD!!

Hutten's Commercial Slide Rule by Nestler  The overall condition of this unusual merchants sliderule is nice. There is a small stain on one end. There is no damage to the rule, cursor, or hard black case.

Fine . . . . . $45.00     SOLD!!

Sun Hemmi # 256 Electronics Slide Rule This is a nice condition rule still in its marked plastic sleeve. It has seen little use. It has a very unusual setup on the back side and is geared toward electrical calculations.

Good + . . . . . $75.00     SOLD!!

A. W. Faber "Castell" No 378 Electronic Slide Rule This Bavarian made slide rule is geared toward electrical calculations with the words Dynamo, KW, HP, Volt etc. There are numerous sites online that discuss its use. It has 3 cursor lines. It is in fine condition as is the case.

Fine . . . . . $34.50           SOLD!!

A. W. Faber Slide Rule w/ Hard Case & Decimal Keeper Cursor The condition of this Sliderule w/ unusual cursor is very nice. There is no damage to the rule, cursor, or hard black case.

Fine . . . . . $50.00        SOLD!!

US Blue Co. 1876 Sun Hemmi Slide Rule w/ Magnifier   This bamboo and laminated plastic sliderule is about 11" long. The case says it is an 1876, and that is US Blue Co's number. This rule has its own Sun Hemmi number that I could not figure out and the rule itself has no model #. The interesting and rare feature here is the flip up or extendable magnifier. I found other examples w/ rectangular magnifiers, but no other round ones like this. I believe it dates from the 20's - 30's. Nice!!

Good + . . . . . $75.00     SOLD!!

Sun Hemmi 259D Engineering Slide Rule Pretty nice.

Fine. . . . . . $45.00       SOLD!

Faber Castell No 2/83N Novo Duplex Slide Rule This German made slide rule comes in its plastic case with instructions in German. It is in very good condition. It has some minor areas of discoloration / browning along some edges. It has 3 cursor lines. All the scales and other printing are clear and bold. The cursor is nice. There is a small break in the plastic case lid (top left corner) as shown in the pics. There are numerous sites online that discuss it.

Good + . . . . . $175.00          SOLD!!

Post 1460 Versalog Slide Rule An early version edge marked on the rail with model and maker info. Like new in the box.  Nice!!

Fine . . . . . $75.00    SOLD!!

Charvoz Aristo 971 Hyperbolog Slide Rule   This German plastic sliderule is like new in the box w/ case and instructions. Nice!!

Fine . . . . . $75.00        SOLD!!

Faber Castell Slide Rule 2/83 w/ Case and German Manual Overall nice condition. All plastic, good cursor. Includes plastic case and manual in German. One of the last rules Faber Castell put out.

Good + . . . . . . . $125.00        SOLD!!

Pickett #52T Air Force Photography Slide Rule  This aluminum sliderule is a Type 1-A. It is in like new condition.

Good + . . . . . $50.00        SOLD!!

Sun Hemmi #269 Civil Slide Rule This sliderule is like new in the box w/ hard case. Nice!!

Fine . . . . . $65.00     SOLD!!

Pickett #520-T Air Force Photography Slide Rule  This aluminum sliderule is a Type 1-A. It is in like new condition still in the wrapper. Nice!!

Fine . . . . . $60.00      SOLD!!

Post Versalog 1460 Slide Rule Made by Sun Hemmi. This is a very nice bamboo rule.

Good + . . . . . $50.00      SOLD!!

Post Teledyne Versalog 44DA-610 Slide Rule Made by Sun Hemmi. This 6" Versalog rule is the same as a 1461. A very nice bamboo rule.

Good + . . . . . $95.00     SOLD!

Calculator / Slide Rule Pen These mechanical pencils are a pretty neat calculator / slide rule designed to do multiplication and division. The instructions are here, but pretty tattered.

Good+ . . . . .$150.00         SOLD!

A. W. Faber #367 Slide Rule w/ Keeper Cursor This unusual slide rule is in very nice condition and is w/ its original hard case w/ advertising. Slide Rules with unusual style cursors like this are very hard to find. This cursor acts has what is known as a Keeper or counter allowing the user to keep track of his calculations as he works on a problem. The condition is super with just minor l9osses to the label on the box.

Fine . . . . .$145.00        SOLD!!

Fowler Long Scale Slide Rule / Calculator   Fowler is a well known English name in circular sliderules / calculators. They made a variety of different models and size calculators including many circular versions like this one. Some were designed for architects, or engineers, and others were made for the textile trades. Larger ones are referred to as Magnums, and this 2 3/4" model is referred to as the pocket size. This Long Scale Fowler calculator is in super like new condition with its outer hard shell marked case. The original instructions are included as well. There is a plaque inside the case that gives the location as Manchester England. There is a serial number under the glass on one side, but there is no specific model designation other than the long scale that I can see.

Excellent . . . . .$495.00         SOLD!!

Ross Meridiograph This is a field used calculator to determine the true azimuth. I suppose for use prior to setting up a solar transit or compass in areas where their use was required. It is by Ross who also made another unusual slide rule. There is a lot of paper that goes with it so be sure to see all the pics.

Fine . . . . . .$75.00        SOLD!!

Pickett N 300 T Slide Rule in Case w/ Box This is like new. A nice 6" rule!!

Fine . . . . .65.00          SOLD!!

Vernon Farm Calculator / Circular Computer / Slide Rule for Farm / Gestation    This unusual 12" farm related advertising circular sliderule / calculator dates from the 40's -50's. It was made by the Vernon Company of Vernon Iowa and was copyrighted in 1948 by George De Vries. They can be found with many different names and locations from all over the Midwest. I believe they were give-aways from different seed companies, grain dealers and farm equipment dealers. This one is from an outfit, Glen R. Green of Ridgeway MI that dealt in Ferguson Tractors and farm equipment.

They were a very well made device that held up well over the years and many are found in super condition. That is probably explained by the fact this was a solution looking for a problem that did not really exist. I doubt many farmers of the time really saw, felt, or understood the need to use it and most ended up in the drawer or hung on the wall. Look at all of the pics to get a sense of all the different things this could compute for the user. An interesting calculator in super condition.

Fine . . . . .$65.00        SOLD!

Vernon Farm Calculator / Circular Computer / Slide Rule for Farm / Gestation  This unusual 12" farm related advertising circular sliderule / calculator dates from the 40's -50's. The condition is like new. It was made by the Vernon Company of Vernon Iowa and was copyrighted in 1948 by George De Vries. It is complete with instructions for use. These calculators / computers can be found with many different names and locations from all over the Midwest. I believe they were give-aways from different seed companies, grain dealers and farm equipment dealers. This one is from the Critic Quality Feeds a well known outfit from that period.

They were a very well made device that held up well over the years and many are found in super condition. That is probably explained by the fact this was a solution looking for a problem that did not really exist. I doubt many farmers of the time really saw, felt, or understood the need to use it and most ended up in the drawer or hung on the wall. Look at all of the pics to get a sense of all the different things this could compute for the user.    An interesting calculator in super condition.

Fine  . . . . . $50.00     SOLD!!

Pickett #109 ES Circular Slide Rule This 109 ES Pickett circular slide rule is pretty hard to find, and it has its leather case as well. Nice.

Good + . . . . .$85.00      SOLD!!

Dietzgen Microglide Trig Type Log Log Slide Rule   This looks like it was made by Hemmi. Nice!!

Fine . . . . $85.00     SOLD!

Post 1491 Chemist Slide Rule   This is a Hemmi product. It is a pretty rare rule.   Nice!!

Fine . . . . .$125.00      SOLD!

The Standard Calcumeter   This is an interesting dial type adder / calculator. These can be found with different numbers of dials. This is an upgraded model with a reset dial on the far right. The patent info is on the side, and the ends are marked with a location and the serial number.

Just what every money changer needed to add up the days take or to calculate out his bonus.  Very Nice!!

Excellent  . . . . .$125.00      SOLD!

The Comptator Adder / Adding Machine in Wooden Case The Comptator is a multi-column adding machine with a stepped sliding mechanism. This version is marked Hans Sabielny Dresden and dates from the 1920s. This 9 column adder / adding machine is in fine condition.

To operate the stylus is inserted in the toothed slides and is drawn down advancing the register by the number of places. The slides remain in their final position so the value entered can be read back. The slides spring back to their home position when released by the lever on the left-hand side. The lever can be latched down to give an immediate return if checking is not required. The register has an automatic carry mechanism. To clear the result, the knob on the right is pulled out and turned anti-clockwise.

The machine was designed in 1891 by Peter J Landin and was patented. The US Patent # is 482312. The device was manufactured and sold as the "Rapid Computer Adding Machine" from 1893.

The Comptator name was used for an improved version built by Schubert & Salzer of Chemnitz Germany from 1909. Production was transferred to Hans Sabielny of Dresden from 1922. Sabielny was later involved in the manufacture of Facit calculators in Dusseldorf during the 1950s and 60s.

Fine . . . . . . $100.00        SOLD!!

A. Lietz Merchants / Bankers Slide Rule  This rule dates from before the WWII. It looks to have never been used. The case is fine. The catalog / manual is nice, and this rule and its scales are described inside.

Good+  . . . . .$75.00      SOLD!!

Castell 63/22 Addiator Slide Rule   This 6" sliderule is set up with a slide rule on one side, and an addiator, or adding machine on the other. It even has the pointer for the adding machine. Complete w/ cloth like case. It is a very hard to find combination rule / adder.   Nice!!

Fine . . . . .$95.00      SOLD!!

Easterly Rafter Calculating Slide Rule   This unusual rule to help the carpenter figure his roof cuts hails from Healdsburg CA. It was copyrighted in the 1940's.   Different & Nice!!

Fine . . . . .$55.00       SOLD!!

Sun Hemmi #153 Slide Rule This is a nice rule in like new condition!!

Fine . . . . .$75.00       SOLD!!

Consul the Educated Monkey Calculator   This is a real, early, and original model of this great idea. It is not one of the new fake knock-offs. These came out about the time of the Scopes trial back near the turn of the century in TN in the seminal case pitting creationists against teaching evolution in our schools. I wouldn't doubt that this idea was introduced as a tongue in cheek way to drive the creationists crazy.Think of it, a monkey teaching kids how to add, subtract, or multiply.Blasphemy. Maybe not though, if todays wingnuts get one more appointment to the Supreme Court who knows what tomorrows kids are going to be taught in schools.Who you voting for? 
Nice!!

Fine . . . . .$125.00       SOLD!

J. Long London Proof Slide Rule  An interesting slide rule for calculations having to do with determining the alcohol content, or proof, of liquids like wine of hard liquors or spirits. Such rules are oftentimes found in Sykes Hydrometer sets. The maker name J. Long, and location, 20 Little Tower Street London are on the top rail. It is in very nice condition.

Fine. . . . .120.00         SOLD!!

Sun Hemi Electrical Engineering 256 Slide Rule This is a nice looking sliderule!!

Fine . . . . .$95.00       SOLD!!

Sans Streiffe #311 Duplex Slide Rule This is a nice looking sliderule in its case w/ original box & instructions!!

Fine . . . . .$65.00      SOLD!

September 2, 1851 Patent Samuel Young Interest Calculator  The patent holder of this unusual slide rule like interest calculator was named Samuel Young and he hailed from Eaton Ohio. The patent number is 8329 and the patent can be looked up using Google. It is a rare and early piece that there is little reference to or information about on the internet. The Smithsonian has the patent model for it, and has a pretty extensive write-up on the patentee. That page can be seen here  http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_690825&repo=DPLA

In reading his Bio there it seems he had two other patents for other calculation devices with this one being the middle one.   The overall condition is pretty nice noting that one of the slides is damaged. The patent lays out how it is operated and what the scales are for and how to use it.  From my reading it seems different bars represent days, weeks, months and so forth. Different and an opportunity not to be missed.

Good . . . . . $ SOLD!

Geotec 341 3012 Versalog Slide Rule   This rule is mint and still sealed in the plastic. Geotec was a Canadian outfit and their rules were made by Sun Hemmi.   Nice!!

Fine . . . . .$95.00       SOLD!!

Loga Modell 6400 Topo Circular Slide Rule This is a nice looking sliderule with its leather pouch.

Good + . . . . .$145.00 SOLD!

Pickett N4 Aluminum Slide Rule   This is a very nice rule in its original box with case and instructions. It displays no signs of use. Very unusual and very nice!!

Fine . . . . .$75.00       SOLD!!

20" Dietzgen #1762-P Mannheim Slide Rule This is a nice looking sliderule in its original case. The rule has a bit of a sway to it, but it still slides easily.

Good + . . . . .$75.00       SOLD!! 

Halden Calculex Circular Slide Rule / Calculator  The condition is excellent and it is complete with its instruction booklet and flip top aluminum case. It is English and this one is only marked with the original makers name. This type calculator was offered by several different distributers like Dietzgen, and K & E and others back around the turn of the century. A piece of calculation  history.

Fine  . . . . .$150.00       SOLD!!

Odelco / Sun Hemmi 269 Slide Rule NOS. A Japanese Sun Hemmi product marked Odelco for the Philippine distributer.   A hard to find and nice rule!!

Fine . . . . . $75.00      SOLD!!

Dietzgen 3193 Slide Rule w/ Magnifier & Humped Case  This is an unusual variant with a fitted magnifier and its original nice condition humped leather case to allow for that. The overall condition of the rule itself is nice.  I believe it is the equivalent of a K & E 4053-3. It is marked w/ 2 patent dates. August 9 1904, and June 28 1898. Nice!!

Good + . . . . . $50.00   SOLD!!

Castell Addiator w/ Slide Rule   Adding machine w/ stylus on one side, and a slide rule attached to the other side. Nice noting small chip on bottom right of rule. I see no number on the rule, but believe it is a Faber-Castell 67/54 RB Darmstadt/Addiator.

 Good + . . . . . $50.00     SOLD!!

The Equationor or Universal Calculator Patented & Copyrighted by Walter Hart The Equationor circular slide rule / calculator patented & copyrighted by Walter Hart is one of the rarest and most unusual slide rules ever produced. There are no other examples, other than this one, to be found or viewed with internet searches. There is one article by Conrad Schure about the Hart Equationor in a 1992 issue of  Oughtred Society's publication. Also the Library of Congress has a copy of the 32 page instruction booklet that anyone can download for free as a PDF. Beyond that there are just resellers trying to market copies of the instructions that can be had for free further down the page.

The face of the calculator has a wealth of information printed on it. In the left top corner are the 2 copyright dates from 1888, and 1889. In the left corner are patents from July 31 1888, and April 29 1890. The 1888 patent # is 387,070 and is titled Sliding Logarithmic Scale. It is viewable with a Google search. The second patent from April 29th 1890 closely resembles the calculator as it exists, right down to the sliding magnifier. That patent # is 426,444 and is titled Sliding Calculating Scale. It too comes up with a Google search.

The simple and ingenious logo Walter Hart came up with to market his calculating slide rule, that took 32 pages to explain how to use, was "Arithmetic Without Figuring". Simple Genius.

The condition of this Hart Equationor is exceptional. Many circular slide rules have a problem with the scales peeling, chipping, or otherwise deteriorating. Not so here. There is a fine alligatoring texture to the surface that looks to be factory and not damage. The face is near flawless w/ one small dent chip. The magnifier is very nice. The box is original and w/o lid.A super nice and rare piece of calculation history that will display well and be a great addition to the old office, slide rule, or calculation related collection!!  Enjoy.

Fine . . . . . $6295.00     SOLD!!

"The Universal Adder" Patented July 15th 1890 Adding Machine George B. Fowler of Chicago, Illinois, was granted his first patent (US39222) On 14th July, 1863, for a similar adding machine. The patent model of that sliding bar adder is viewable online.

In 1890 Fowler received a second patent (US432266) for an improved version of his adder that was renamed The Universal Adding Machine. It was sold by the Universal Adding Machine Co., NY, NY, for $8. It was an improvement with essentially the same appearance as his earlier patent. Both patents can be found online.

This sliding bar adder, according to the info on the front case, was patented in England, France, Germany, and Canada as well as the US. It was a well done and interesting design, with a window in the back of the unit to view the current result. There is a site that gives a good history and instructions on how to operate and view the results. That can be found searching this

arquivo.fluxo.info/conteudo/history-computer.com/history-computer.com/CalculatingTools/Gadgets/Fowler.html

The body has an ever so slight warp making sliding the bottom two scales marked millions a bit harder to move. Overall the condition is very nice with just minor losses to the finish on the front. There is also a paper label and instructions with some losses on the backside as can be seen in the pictures.

It is interesting to note that the only other example of a "Universal Adding Machine" of the same design and with the same finish as this one that Google knows about was one I sold over 20 years ago and can be viewed on my past sales website. www.antiqbuyer.com/past-sale-archives/scientific/sliderules-1.htm  I would think that would make this a pretty rare piece of calculation history.

Fine. . . . . $795.00          SOLD!!

Pilot Balloon Slide Rule MK IV A Pilot Balloon slide rules were made for the British Meteorological Office by different makers.

The Pilot Balloon slide rule is used to convert the observed azimuth and elevation readings into wind velocity and direction records. The use of slide rules and plotting boards was rendered obsolete with the wide spread adoption of computers and programs to do the calculations, as well as the decline in the use of optical pilot balloon theodolites.

A nice piece of calculation history that will display well and be a great addition to the old office or calculation related collection!!

Good  . . . . . $225.00      SOLD!!

Alpina Adder / Calculator Here is an rare Alpina Adder / Calculator in its hard hinged case pictured. The Alpina Calculator is a hard to find calculator / adding machine, especially in this nice condition. It is in very nice original condition and the finishes are near perfect noting one small rub on the backside. There is also an empty screw hole on one end. It does not affect the function, more like to help hold the outer housing in place

These small German made calculating machines were only produced for a couple years in the 1960s and less than 4K were made / sold. I looked pretty carefully, and do not see any serial number.

It seems, and for good reason, the Curta calculator was far more popular, not to mention easier to operate, and the Alpina just could not compete. A great addition to the calculation / scientific collection.

Good + . . . . . $1295.00         SOLD!!

Dempster Rota Rule Slide Rule Model AA w/ Magnifier, Case, Manual & Box A rare and hard to find circular rule especially in this nice condition. The serial # is 1293 and it dates from the 1930s. I see no issues other than the outer box having some scuffs. A great addition to the collection.

Good + . . . . . $695.00        SOLD!!

Eastman Kodak X-Ray Exposure Slide Rule     There is a copyright date of 1919 on the back side of this unusual double slide slide rule. There are also directions for use here that are pretty vague and lead one to wonder how many people they were overdosing when they were performing this new technology on patients way back when. One of the two slides that move has scales on both sides talking about the spark gap and tube distance. THe other is for the type of film used.  The fixed scale on one side is all about different body parts and on the other is exposure time in seconds ranging from 1/16th to 64. 

There is a slight bend in the body of this (probably due to overexposure), but everything still moves and slides as it should. It measures 2.5 x 5". The outer case as seen in the picture is a bit ratty, but the rule itself is pretty nice, noting one minor tight crack in the bottom right corner in the greenish cover.  A rare an unusual piece of medical or X-Ray related memorabilia.

Good . . . . .$195.00       SOLD

Pickett Model # 6-T Statistical Quality Control Slide Rule    Overall this rule is in very good condition. Special use slide rules from any company are much more difficult to find, and this one aimed at statistical analysis is no exception. I count 28 scales to keep you occupied, and I wish I could tell you the significance of them, or why this is special for statisticians but I cannot. I do know that only a few have been offered at the internet auction, and that new in the box I have seen them for a lot more money than this one.

Good . . . . .  SOLD

The Smallwood Calculator  The adding machine itself is near mint, as is the walnut base it is set into. Marcia Palmer did lightly put her name in the top rail. The small wooden original stylus is present. The protective case, which is a triangular cardboard box, has one end popped loose, and the patent date is on the front of it in small gold lettering and looks to be Feb. 23, 1---, with the last numbers being unreadable. These interesting and desirable adders were produced by different manufacturers over the years. This example, The Smallwood,  from Oakland, CA,  is one of the harder ones to find, and even more so in this condition.

Good . . . . .  SOLD

Castell / Faber #2/83 Novo Duplex Slide Rule   This rule is 15" long and is one of the most sought after and popular of all rules put out by this company. There are at least 30 scales, and a host of color schemes to help you keep things figured out. If you need help with them the super condition 30 page manual is here as well. There is also a conversion chart and ruler in the bottom of the case. The rule is in excellent condition, and has no problems with any aspect of it. The case is cracked across the bottom. A rare rule, and a welcome addition to the hoard.

Good . . . . .  SOLD

Otis King Model A #6992 Circular Telescoping Slide Rule / Calculator   Here is an early version of this English favorite, and it is in super condition. There are two scales #423 & 414, which are both in great condition, with no peeling or other problems. These earlier models were done in white on black for the scales to give them more contrast. I have had later models that were done reverse of this. This one also has a small ring at the top which later versions do not have as well. Lastly there is the calfskin slip cover that has the name still visible, but it is in a very fragile state, and both the top and bottom are missing.

Good . . . . . SOLD

A lesson in
Partnerships Going Bad

This.



c. 1700 Pierre Fardoil Adding Machine & Watch / Time Piece I am half owner of the 18th Century Pierre Fardoil Adder / Adding Machine and Fardoil Watch / Time Piece pictured. I am selling my 1/2 share in this early Fardoil Adder. The other half owner is Peter Frei, an antique dealer based in Massachusetts. Since I have started trying to sell my 1/2 share in the Fardoil Peter Frei now claims we are not, and never were partners in the Fardoil. That is a strange claim for him to make given our past history and communications regarding the Fardoil.  It also has the effect of him finally putting in writing what his true intent has been.

Below is a condensed history regarding our partnership and the Fardoil Adder.

Approximately 10 years ago after buying the Fardoil Adder and timepiece from a private party as 50/50 partners, the Fardoil adder and Fardoil time piece were sent to the Breker auction in Germany where they "sold" for approx. $74,000. That "sale" failed after the winning bidder backed out for reasons explained later. The Fardoil Adder / Adding Machine and Fardoil Pocket Watch pictured here are the very same 2 pieces that were offered at the Auction-Team Breker sale. That auction write-up and result, with no mention that the sale failed, can be found online at Liveauctioneers.com/item/36708195_the-adding-machine-of-pierre-fardoil-c-1700.

Shortly after the failed Fardoil sale Peter Frei, in a fit of faux outrage, declared we were no longer friends over a situation concerning an antique sewing machine we were also 50/50 partners on. At that time he did admit, in writing, that we were partners in the Fardoil. He has alluded to that fact numerous times in writing since then.

Peter and I had been partners in several other technology-related antiques prior to having a falling out over that sewing machine. Here is a concise telling of the story about it. At an auction, Peter bought and I paid for the base of a Fancy Leg Florence sewing machine base that had no head. I later found and bought the missing head and sent that to Peter, basically completing the machine.

Peter then, without consulting or discussing with me, entered into an agreement with a 3rd party offering that dealer 50% to sell the sewing machine. That reduced me to a 25% junior partner. When I questioned that, Peter, in a fit of faux rage, declared we were no longer friends and that our partnership was over. Recently Peter completely rewrote the history of that event, claiming he sent just the base to Brekers Auction and we simply split the proceeds. That telling of the story was a complete factual fabrication. That is easily provable. There are more details and facets to this story that are irrelevant to this sale and do not need to be retold right now but I have, in written correspondence with Peter what happened that clearly shows what transpired.

NEW DEVELOPEMENTS: There have been new developments since I have begun to try to sell my 50% / half share in the Fardoil.

First, Peter Frei removed the ad for the Fardoil from his website where it had been listed for sale for appox. $74,000. When I wrote Peter inquiring why, asking if it had been sold, or what his intentions were, he did not respond. In addition to the ad for the Fardoil on my two websites I also ran an ad on eBay so that a broader audience would be able to view it.

Peter Frei complained, not to me, but to eBay and had that ad taken down. He then posted his own version of an "ad" which in reality was just a rant / personal attack in which he claimed we were not, and had never been partners, and further claimed that he is sole owner and had only offered to split the proceeds of the sale of the Fardoil with me out of the kindness of his heart. But now that I had upset him, I am no longer due or entitled to anything. In his own words "my generosity has its limits"

For the last 10 years we quietly tried to work with him to settle up for the Fardoil always fearing he would make that claim. Given his current actions it is now clear Peter has no intention of honoring our partnership and splitting the proceeds from the sale of the Fardoil. And now when I have finally gone public and am attempting to sell my share of the Fardoil he has lashed out with personal attacks and delusional claims of sole ownership.

I am still rightfully and legally half-owner of the Fardoil and owed half of the proceeds if, or when, the Fardoil is sold. For the last 10 years Peter Frei has masked his true intent, stalling and hedging, but he has now put in writing what his true intent is / has been and I believe has opened the door for a legal action to resolve a relatively simple question.

There is no question that I can prove my half ownership rights. I can also prove I paid for half of the 2 pieces and have never received any compensation. I can also demonstrate that Peter Frei's ownership claims and the related story have changed over time, flip-flopping around depending on circumstances or his mood. In other words he has demonstrated that he has little credibility by changing his story over time. My story, backed in writing, has not changed.

I am not a lawyer, nor in a position to begin any legal actions myself to assert a legal ownership claim, but if credibility and truth still matter in this current era of "fake news" we now live in, it would seem a legal claim in court has good probability of being successful.

Another important development is the French museum CNAM, who 10 years ago had expressed an ownership claim prior to the Breker auction which helped cause the failed auction, have recently expressed no interest or ownership rights in the Fardoil, even when offered my 1/2 share as a donation that would have given them a legitimate ownership claim.

Below is the history / background of this rare piece of calculation history and my interactions with Peter Frei since the failed auction so potential buyers can have a better understanding of the background and get a sense of what to expect, or develop a plan on how to proceed.

The Fardoil adder was bought in upstate NY prior to the Breker auction from a private party. The owners contacted me first and I made an appointment to go see it. They told me that the adder had been "found" in New York, and the now deceased "finder" had been a caretaker / custodian / groundskeeper / employee when he "found" it. The family told me they had had it appraised at Sotheby's or Christies auction house for approx. 5K. I offered to purchase it from them for the same amount in cash.

The family / sellers initially said no. Months later the owners called me and said they were ready to sell the Fardoil. Because I was back in CA at that point I called Peter and offered him a 50/50 partnership to go and get it. He agreed and went and purchased it. We split the cost 50/50. Peter later found and bought the Fardoil watch and we split the cost of that as well. I have never received any compensation for those monetary outlays.

Those are facts that are not disputable although in his current writings Peter has now attempted to rewrite history with a story line that is easily refutable. We had a history of similar "gentleman's agreements / deals" in the past. There was nothing unusual or out of the norm about those deals or this one. I believe that given his flip flopping changing story in regard to the Fardoil, and the sewing machine episode, Peter will have no credibility when confronted with his past written statements.

Peter handled consigning the Fardoil to Breker's Auction. Prior to the auction the French Musee des Arts et Metiers / CNMA expressed an ownership right and claimed their Fardoil adder was "lost", stolen, or otherwise disappeared from their collection when it was on display in the US during the 1939 New York World's Fair. The Breker auction failed after the CNAM cast doubt on the rightful ownership of the Fardoil and the Arithmeum Museum, who was the high bidder at the auction, backed out of the sale.

This Fardoil could be the only known example if it is the same one that the CNAM expressed an ownership right to prior to the Breker auction. After the auction failed to produce a sale Peter attempted to market the Fardoil to the underbidder and other parties. Later the CNAM made a relatively low offer, not to purchase the Fardoil, but rather as compensation for having found it and returning it. That offer was rejected.

The high bidder at the Breker auction for the Fardoil Adder had been Professor Korte from the University of Bonn. He was bidding to acquire it for the Arithmeum Museum in Bonn, Germany. My understanding is that Korte backed out from finalizing the Breker auction sale due to the CNAM claim that the Fardoil was rightfully theirs. Because of the controversy this created the underbidder also backed away when it was offered to him after the auction. The two Fardoil pieces were then returned to the consignors---myself and Peter Frei. Peter Frei now has possession of both pieces.

Then something akin to the storyline in Lord of the Rings began to unfold, and the "my precious" concept, much like with Gollum and his "my precious / the ring" in that story, began to take hold. Peter, despite saying he was ready to sell, and that he wanted to sell the Fardoil, could not bear to let the Fardoil go, or have it leave his hands.

The disclosure of these details is necessary because I want to insure there are no claims of non-disclosure or other problems down the road from a buyer or new partner in my half share. The attempts after the failed auction for Peter and I to settle up on the Fardoil also need be told so that potential parties are fully informed and can better formulate a plan of how to proceed with Peter.

After the failed auction, and over the next 10 years, Peter offered several proposals to resolve the Fardoil situation between us, all in writing and documented. Peter reneged on following through on every one of them. For the record, we will review some of Peter Fries' past proposals:

Immediately after the auction Peter wrote that if the high bidder or under bidder would not pay the original sale price it had brought at auction he would simply buy us out for 1/2 of the high bid, as we both felt it had not reached its full potential because of the French interference. He never followed through on that proposal, later claiming it was just a negotiation tactic.

Shortly after the auction Peter announced we would settle up over the Fardoil by having a private auction between us, with a third party holding the Fardoil until that process was complete. We agreed to that proposal. He later reneged on that proposal claiming he did not have enough money to proceed.

Peter next demanded we wait, and be patient, as the Fardoil was, in his words, "burned" and its value diminished by the French claims, and the failed auction.

In 2019, 5 years after the auction and after numerous requests by us to resolve the situation, Peter said to wait one more year to see if he could sell the Fardoil from his new website. In writing he said that if it did not sell from his website at the end of the 1 year period we would send it to auction again. He proposed that in writing and then reneged on that solution with no explanation, and just offered lame excuses about being busy, or having other irrelevant personal issues. 

Peter next suggested we should name a price he could buy us out at, with the stipulation that he would need 6 months to gather the money, a proposal that was neither fair nor equitable, but in the interest of ending this ordeal we proposed selling our half interest to him for $18K --- approx. 25% of the original sale price of $74K it had reached at the Breker auction. $18K equated to approx. 50% of what we were due had the auction succeeded---a fair and reasonable offer to resolve this.

In writing Peter rejected that offer outright and said he would never pay that amount.  He offered no meaningful counter or further discussion. That was over 2 years ago, much longer than the 6 months he said would be needed to raise funds to buy us out, once again reneging on a proposal he himself put forward.

Most recently in Dec of 2024 we suggested listing it for sale on our own two websites, Patented-Antiques.com, and AntiqBuyer.com, at a lower price, to give it more exposure, and to enhance its desirability and value. To do that we needed to discuss a price beforehand that we could all agree to. Peter declined to discuss a lower price and then hours later wrote that he alone would decide if he would agree to a lower price---AFTER I found a buyer---a stupid and unworkable proposal not worth discussing further, and mentioned here only to illustrate the absurdity and his "my precious" attitude.

We next sent him a demand letter outlining his prior proposals as outlined above, and demanded he act on one of them or I was going to try a new approach, that being selling my 1/2 share, or donating it to the French so they would have a legitimate legal claim of ownership that they could pursue. He responded, and I paraphrase, Good luck with that, and stopped all further communication.

After that we decided to proceed with the plan to sell our 1/2 share, or take on a new partner in our 1/2 share / half interest in the Fardoil, or donate our half share to an interested party with just a few conditions or caveats. Bottom line, at this point, I am willing to sell my interest in the Fardoil for nothing more than a small earnest money deposit. I am simply looking for a qualified and acceptable party to make a reasonable proposal or propose a course of action to pursue that will rectify the situation. With that relatively low dollar amount as a baseline there is a lot of room for a qualified and interested party to add an important piece to their collection for a very small cash outlay, after a positive resolution.

I will sign an acceptable agreement drawn up by the new partner, their lawyer, or other representative. If the French / CNAM want to reconsider their ownership position and establish a legitimate 1/2 ownership to the Fardoil I will still extend this offer to them as well.

This proposal for my half interest in the Fardoil would be a great deal for the right person or entity who thinks they can better deal with Peter Frei and somehow force a sale or close the deal. Just think, a documented 1/2 ownership in a rare probably one-of-a-kind and unique piece of calculation history for a fraction of its potential value!

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FARDOIL

Fine . . . . . . $1,000.00 . . . . . Earnest Deposit

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