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"Slide Rule-Online-Museum"


Displayed are some slide rules in my collection. 
You may select out of the following applications:


production technology and mechanical engineering
electrical engineering
constructional engineering, concrete technology
pipe-, gas and fluid supply, heating technology
chemistry and chemical engineering
sales and commerce
medicine, healthcare
pocket slide rules
slide rules for schools
circular slide rules, discs

Here you see a comparison of some scales and runners. It demonstrates a little the development of slide rule design during the 1905s on the one hand and at 1975 on the other (ist was almost the end of the slide rule era which lasted appr. 350 years):

This wooden slide rule (length 280 mm) has been  made by  A.W.Faber Castell in 1905 (type 367). The scale system is the simple with only two pairs of scales from 1 to 10 and from 1 to 100. Its scale design was typical for that period: looking like a railway track the points along the scale are under and upper lined. The runner has a special feature at the right side: as a remembering aid with a turnable arrow the decimal points can be marked.


Another old slide rule is made by Gebr. Wichmann (Berlin). It has been manufactured approximately between 1910 and 1920. The scale system is simple too, it is called "Mannheim system" with only two pairs of scales: in the upper part A / B and in the lower part C / D. The runner is made of iron sheet with two noses at the left and the right side. The slide rule has a length of 280 mm, it is made of card board (!).


A sharp contrast to the above shown A.W.Faber Castell No. 367 and the Wichmann slide rule are the very modern types FABER-CASTELL  No. 2/83N (manufactured in 1975) an ARISTO Hyperlog No. 0972.  These items demonstrate the end of an almost 350 years lasting period of slide rules. Both models are high sophisticated duplex slide rules for scientifical and technical calculations. They are each 370 mm long and made of high quality plastic.
The scale system of the 2/83N looks extravagant with 15 scales on both sides, which was probably the maximum limit because of a reasonable and easy handling of the slide rule. A peculiarity are the W-scales. Their initial length of 500 mm is split into two parts each of 250 mm length (W1: range from 1 to 3.16) and (W2: range from 3.16 to 10). This results a double high reading accuracy like normally.

Front- and backside of Faber-Castell 2/83N


The biggest model from ARISTO was the 1974 made "Hyperlog" (0972). It is 370 mm long but has a larger width and 31 scales in total. I think that was the maximum ever buildt.

Front- and backside of ARISTO-Hyperlog


Links to other slide rule related web-sites:   The site of the German slider rule collectors gives information on activities, national and international meetings. In the online journal "RS Brief" you will find a lot of interesting articles about slide rules and other mechanical calculation devices.

The Oughtred Society, dedicated to the history and collection of slide rules

Sphere Research's Slide Rule Universe with a lot of producer related archives

Mike Konshak's International Slide Rule Museum - a huge collection of slide rules from different countries




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This web site is owned by Prof. Dr. Jörn Lütjens (Hamburg, Germany)

© J. Lütjens, Feb. 2014