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Slide Rule Sales Archive

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

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+ ...........$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 Carl 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!!     

Excellent ........$975.00    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 Carl 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.               EXCELLENT ..........$995.00   SOLD 

Lafayette  #98-70129 Vectorlog Slide Rule    This rule was made by Relay a competitor of Hemmi I believe.  It is slightly dirty, but in very nice overall condition.  I count 26 separate scales.  The leather case is nice with minor scuffs. These off brand versions of rules are becoming increasingly hard to find, and should be a good investment in the long term.  This is a nice one.  

Excellent ......... $85.00     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+ ..... SOLD

Nestler # 0260 Mecanica Slide Rule  This 10" rule is mint in its case.  Very Nice    

Good ..... $65.00       SOLD! 

Aristo-Commerz #965 Slide Rule  This is a nice rule by one of the earliest of German makers.    The case and rule are virtually unused.  Different and Nice!    

Excellent ......... $45.00      SOLD!      

Jason # 803 by Relay This rule is in super condition.  The case is as new, noting that Wolfgang signed it on the inside.  The rule is like new as well.  Relay made a series of rules under different company names hat are the same quality and have similar features to those made by Hemi, and are in general far rarer and more difficult to find than those.  This is an exceptional rule condition wise.  It has 25 scales no serial # and is as nice as one could hope for.   

Excellent+.......$85.00           SOLD!  

12" Boxwood Sector Rule  This unusual rule is the forerunner to the slide rule, and they are often found in the 6" size, but are quite unusual in this 12" size.  This example is unmarked as to maker, but probably dates from the early 1800's.  The condition is quite nice noting the two small dings on the upper rail.  I have never fully understood the proper operation of these devices, but the information has been published, and I have been to websites that discuss their use in detail.  Different and Nice!!        Good+..... $125.00        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++ ..... 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.      Fine ..... $165.00     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 +....... $145.00   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.       Excellent ..... 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 other versions that were done in reverse of this, but they were later models.  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.    SOLD! .....  

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