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. Most items in my collection fit this definition but the odd novel calculating aid + some hybrids can also be found.
My special niche interest is ♫ acoustic ♫ (they exist!) and oversized desktop slide rules. But I am also attracted to any model with a quirky or innovative scale. 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, many months before the entire collection is uploaded! Monitor 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|
|Blundell Harling Ltd. (BH)||P4463 Holophane Illuminance Calculator|
|Dargue Brothers Ltd / Simplon||SD10 Duplex + any sub-ivory models|
|Engineering Instruments Inc.||Either circular “vinylite” model|
|Fearns Calculators||Barber Shop Harmony Calculator|
|Graphoplex||6245 & 6250|
|Inglis||FLASH: Pricing, Photographic Exposure, Stock Exchange, Foreign Money, Paper Trades & Health Insurance|
|Kingson||Addiator (combined slide rule & slide adder)|
|L&C Hardtmuth / Classic||10" Series III|
|Lawrence Engineering Services||S-M (C.V. Ore) & Exposure (MIT)|
|Nestler||Cursor (runner) for 342 (50cm) & 24b (100cm)|
|Slide Rule and Scale Engineering Co.||- 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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|Aristo||939||Reinforced Concrete - System Göttsch|
|Blundell Brothers/Rules Ltd. (BRL)||E.3||Electro|
|Graphoplex||1614||Demonstration School Log-Log|
|Graphoplex||SHELL||Pocket Petroleum Central Heating Efficiency - NL version|
|Hemmi||30||Lilliput Enhannced Mannheim|
|J. A. Nicholl & Co.||Mark VI||Desktop Artillery for Indirect Fire|
|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|