This non-commercial website was an amazing 60th birthday present from my soulmate Ros. But the website name is thanks to another family member - our daughter Siân. When asked as a teenager what I did, she often told her friends: “My Dad? Oh, he collects expensive sticks of wood!”
When the latest PC/tablet is out-of-date inside 6 months, it may come as a surprise that the Englishman in the image, the Rev. William Oughtred (1575-1660), invented a calculator around 1621 that would be in continual daily use for nigh on the next 400 years. My hobby is collecting and writing about this analogue calculating wonder - the SLIDE RULE. The analogue concept behind the slide rule was successfully adopted and adapted by many trades and professions. Remarkably being able to use such an elegant analogue instrument from a bygone age is still a licensing condition for all private and commercial pilots.
This website is a virtual “display cabinet” for my collection (as I uploaded it) of slide rules, slide charts and the mechanical calculating aids plus a “bookshelf” for my published articles - enjoy browsing.
|A.W. Faber-Castell||8/13, 8/14, 8/15 & 51/88|
|AHREND (Wed. J. Ahrend & Zoon)||642T, 649, 651, 690, 696, 698, 699 & 701|
|ALRO (All-Round)||Beton, Cycloop, GoA, Ha, Piret, Nomographie, Van Leer & WeR4|
|AWF (Ausschuss fuer Wirtschaftliche Fertigung)||SR703, SR705-709, & SR754|
|Controller Calculator||200 R|
|DARGUE Bros. Ltd. / Simplon||Sub-Ivory SR-1 & SR-4 + Honduras SD10, WR-2A, WR-5 & WR-7|
|Fearns Calculators||Barber Shop Harmony Calculator|
|Fowler||Nautical, Artillery, Kearns & Mackay|
|Inglis||any FLASH RECKONER|
|ITAB (Internationaler Tabellenverlag)||Multicalor Flachheizkorper & Styropor-Vollwarmeschutz|
|IWA – F. Riehle GmbH & Co KG||15489 Harmonik|
|Johann Faber||180/080, 180/082, 9203, 9204 & 9204|
|Keuffel & Esser (K&E)||4081-3 Braille version|
|KOSMOS||Book: "De Rekenliniaal" - 11th & 12th Editions|
|L&C Hardtmuth / Classic||10" Series III|
|Lawrence Engineering Services||S-M (C.V. Ore) & Exposure (MIT)|
|LOGA Calculator A.G.||TF, T150, T300, O2 Calculator, 30 TxC & 75 Terminator|
|Nestler||RP 75, Kreisrechner & Disc-O-Lator|
|S.R.&S.E. (Slide Rule & Scale Eng. Co.)||- any -|
|Systeem Matthijssen||- any -|
|Unique||Junior, Study 500/700/900 & J180/181/182|
To learn more about the history of this calculating wonder check out the “Slide Rule History” by the Oughtred Society (OS) or my 2-page summary (in Dutch).
Those needing a “memory jogger” or is intrigued how such bygone analogue calculators worked, the International Slide Rule Museum (ISRM) offers an illustrated teach yourself course: “How To Use The Slide Rule”. Alternatively download the self-running 35mm “slide show” Training Programme with synchronised audio commentary I digitalised. Afterwards try out some test calculations using Robert Wolf's online simulation of the classic Nestler 23R wooden slide rule. If this gets you thinking about starting your own collection, then the UKSRC/OS “Beginner’s Guide to Collecting Slide Rules” is a must read.
For educators looking for maths related inspiration and teaching aids/material then you need to look no further than Nicola Marras’ slide rule inspired website. But if you are just looking for reference works/published books on slide rules try one of these inventories: List 1 or List 2.
It was time for a spring clean. Some information on this website needed refreshing and/or updating.
The changes were not major but I also made the “look & feel” more consistent.
Tom Martin, one of the UKSRC's longest serving members, sadly passed away in hospital at the beginning of January. Tom was an international expert on all things Gauging, Brewing and Hydrometry. He was a warm-hearted gentle giant who would always freely share his knowledge with fellow collectors. Tom will be sorely missed.
Rod Lovett’s facility listing all the slide rules of 14 major makers has recently been expanded with 7 new image archives – click HERE to take a look.
Issue 22 of the UKSRC Gazette is another bumper edition - 160 pages with 20 in-depth articles. As ever, this non-profit publication is excellent value for money & there is even a modestly priced PDF version for parts of the world were postage costs are prohibitive. Use this LINK to order your copy from the UKSRC Subscription & Gazettes webpage.
Thanks to Jose G. Fernández collectors can now download free-of-charge English & Spanish translations of Rechenschieber im Wandel der Zeit - a book published in 2009 by Guus Craenen. It charts the development and evolution of the slide rule from 1787 to 1905. Click HERE to go to the download webpage.
After going digital 15 months ago and over 1,000 free downloads it was time for an update. Edition V8.1 of Peter Holland’s definitive book (in English and German) on every slide rule made by A.W. Faber and A.W. Faber-Castell is now free to download from here ….
Rod Lovett’s latest facility makes the data compiled on Electro types over many years by Bob Adams easy to search. Use it to find all known specialist Electro and Electronic slide rules – try it out here …
HEMMI with its sunburst logo is a highly respected Japanese maker of slide rules. The company has a rich history – operating from 1895-1975. HEMMI chose to make most of their models from bamboo with celluloid veneers. An understandable choice as bamboo was better suited to the humid conditions of their “home market”: Asia. They sold an impressive range of models - many with usual scale layouts. Click HERE to see the ones I have – including two models that each need 4 cursors to work!
Did you know a special model exists for each house of Hogwarts School of Witchcraft & Wizardry? Depending on your Gryffindor, Ravenclaw, Hufflepuff or Slytherin affiliations select your Harry Potter inspired sorcerous slide rule simulation from Robert Wolf’s website ...
Generically a slide rule can solve complex calculations but CANNOT do simple arithmetic. A rare and unusual exception is the newest addition to the collection - a System Korte slide rule that CAN add and subtract!
Ace Hoffman has developed an awesome simulation of a linear, round, concentric and drum slide rule. From Ace's Homepage download a function-rich version for your phone, tablet or desktop.
Lawrence made the only known slide rule considered so vital to the WWII effort that the UK & US governments had it classified - based on research from MIT it calculated radar antenna beam patterns, beam width, gain, etc.
JOS Vol. 31 No. 2