In 1991, while unpacking a removal box, I came across a long-forgotten slide rule from my schooldays. I was intrigued and soon a mischievous almost schizophrenic idea was born: “What else could a computer man collect but analogue slide rules!”
Slide rules come in all shapes and sizes but most are either:
They are hard wearing, do not break when dropped and unlike modern day calculators do not need batteries! Strictly speaking to be a slide rule it must have at least a pair of logarithmic scales and usually a couple of gauge marks. Most items in my collection fit this definition but the odd novel calculating aid and some hybrids have sneaked in!
My speciality is ♫ acoustic ♫ (they exist!) and oversized desktop slide rules. But I am also attracted to any slide rule that incorporates a quirky or innovative scale and any novel application - e.g. for Church bells. My collection has grown to 2000+ slide rules, 100+ slide charts, 40+ Ready Reckoners, 15+ slide or dial adders and 30-odd mechanical calculating machines/aids. To find specific items of possible interest try one of the adjacent search options.
Every month or so a new batch is added but because of the sheer volume involved it will take many months, if not years, before the entire collection is uploaded! So check out the relevant NEWS item on the HOME page to see what was in the latest batch!
|A.W. Faber-Castell||4/60, 4/92, 8/13, 8/14, 8/15 & 8/168|
|Alro||Cobol Analyser, Ha Tex & Truck Tyres|
|DARGUE Bros. Ltd / Simplon||Sub-Ivory SR-1 & SR-4 + Honduras SD10, WR-2A, WR-5 & WR-7|
|Engineering Instruments Inc.||Either circular “vinylite” model|
|Fearns Calculators||Barber Shop Harmony Calculator|
|Fowler||Nautical, Twelve-Ten, Kearns & Mackay|
|Graphoplex||6245 & 6250|
|Inglis||FLASH: Pricing, Photographic Exposure, Stock Exchange, Foreign Money, Paper Trades & Health Insurance|
|L&C Hardtmuth / Classic||10" Series III|
|Lawrence Engineering Services||S-M (C.V. Ore) & Exposure (MIT)|
|Nestler||Cursor/runner for 342 (50cm) & for 24b (100cm)|
|Slide Rule & Scale Engineering Co. (S.E.&S.E.)||- any -|
|Unique||Norman, Perfectus, Dial, Pioneer Long Scale & Junior|
Tip: separate keywords (implict AND) by a space or a comma and if needed, limit the search by adding keywords proceeded by a hyphen: e.g.-Faber, -plastic. Phrases in quotes may also be used.
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|A.W. Faber-Castell||Nijgh & Van Ditmar||Technical|
|Aristo||939||Reinforced Concrete - System Göttsch|
|Blundell Brothers/Rules Ltd. (BRL)||E.3||Electro|
|Graphoplex||1614||Demonstration School Log-Log|
|J. A. Nicholl & Co.||Mark VI||Desktop Artillery for Indirect Fire|
|Kingson||Four-Rule Calculator||Pocket Mannheim Addiator|
|Nestler||0440||Polymath Reinforced Concrete - System Maarschalk|
|Rijnja, P.||Beams - basic||Pocket Wooden Floor & Ceiling beams - System Van Gerven|
|William Langley||Carpenter Timber||Desktop Coggeshall|