German version
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German version |
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"Slide Rule-Online-Museum"
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Introduction:
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
www.Rechenschieber.org 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. 2017