Slide Rules: Selected Items - Easy Ordering

Vintage Instruments offers the largest variety of slide rules for sale anywhere. The complete listing can be seen in the Total Catalog.

This Selected Slide Rules section offers a very nice selection of mainly new slide rules of many types, with easy ordering. This section is particularly useful for anyone looking for a gift or for special deals. Please look though the several pages of slide rules to see the wide variety of rules and prices offered. And if you need a large number of a particular slide rule, please use the Questions and Wants button at the top of this page to request special pricing.

Star Circular Rule, Model 25, Small, New in Box

A very nice, small, pocket size circular slide rule, new in box, with case and manual. Heavy white plastic on a metal disk. 3 1/8 inch diameter.

Scales: K, A, D [C, CI, L]

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Star 130 Circular Slide Rule, New in Box with Case and Manual

A 4 1/4 inch diameter circular slide rule. A good working size. Complete with box, case, and instructions. White plastic on metal disk.

Scales: K, A, D [C, CI, EI]
L, DI, D, tan, tan, sin, tan, tan & sin

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Otis King's Calculator, Pocket Spiral Slide Rule

I have several Otis King's Calculators, the famous pocket-sized spiral slide rule. They were made by Carbic Limited, London, England and were also sold under other names such as Geniac.

The rules are made of metal and are collapsable, being only 6 inches long completely closed. There are two basic models, Model K and Model L. Model K carries a logarithmic scale 66 inches long, from 1 to 10, carried in two sections, Scale 423 (upper) and Scale 414 (lower). Model L has an upper scale like the Model K's. Its lower scale is graduated from 0 to 1, in 2000 equal divisions of .0005 each. This is used in conjunction with the upper scale to give direct readings of the logarithm of any number, by means of which roots and powers are obtained.

Prices range from $150 - $300, depending on condition, case, box, instructions, etc. For further details, please request information using the Questions and Wants button at the top of this page, or click the Total Catalog button at the top of the page, go to the Slide Rules section, and Search for the term Otis. Sample pictures are below.

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Pickett B1, Bamboo-Based Rule

Pickett sold only this one bamboo slide rule, a great collector's item. White laminate on bamboo. The rule is new, in its original plastic sleeve. There is no case.

Scales: LL0-, L, K, A [B, Cos/S, SecT/ST, T/T, C] D, two square root scales, LL0+
LL1-,LL2-, LL3-, DF [CF, CIF, CI, C] D, LL3+, LL2+, LL1+

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20 Inch Slide Rules, Various Makers

Many slide rule makers produced long, 20 inch versions of some of their models. While not as convenient to carry as the standard 10 inch rules, the longer rules offered greater accuracy.

I have many varieties of 20 inch slide rules, which make great collectables, gifts, or user rules. A few examples are shown below. If you are interested, please click on the Questions and Wants button at the top of the page and ask for details.

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Ricoh 105 Rule, New in Box with Case and English Instructions

The Ricoh 105 rule is a very nicely made, standard, white-laminate on bamboo rule, complete, new in box, with case and English instructions.

Scales: K, A [B, CI, C] D, L
On the back of the slide [S, S&T, T]
On the top beveled edge, a 25 cm scale.
Various equivalent measures on the back of the rule.

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Chairman Mao, Chinese Slide Rule, Very Advanced Model, New in Box, with Self-Documenting Scales and Chinese Manual

This new-in-box, Chinese slide rule was made during the Cultural Revolution and is labeled, in Chinese, "Worker, Peasant, and Soldier." The text on the box also says, "Double-Sided Rule," "Auxiliary Feature: For Radio Electricians," and "Tian Jin Slide Rules "

The box further features a saying of Chairman Mao, which translates as: "We, the Chinese people, have the gumption of fighting our enemy to the bitter end; the determination to restore the faded glory with our own two hands; the ability to gain our standing amongst the rest of the peoples of the world."

This is not only a fine, heavy-duty, 23-scale rule with metal end braces, but it is also a piece of history, representing the post WWII, Chairman Mao era in China.

The rule includes a manual in Chinese. In addition, the scales on the rule are self-documenting (they are labeled not only by name, but also by the actual mathematical function they represent). Therefore, almost any good English slide rule manual can be used to learn how to use the scales.

The cases vary in color, but the rules are the same.

Here is a chance to own a new, 40-year-old piece of history, even as China evolves into a world economic power.

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Can't Find What You Want? Look Here.
Many, many other slide rules are available. If you would like help finding something, please just send an email to and ask for help. Thanks.
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  Didn't find what you are looking for? See all Slide Rules in the Total Catalog.