A selection of sites I regularly visit or use for reference. Please let me know if you think I have overlooked any interesting/important sites. |
Site owner/purpose | Description/reason for my interest |
Andries de Man’s site | Prime reference site for original documents on the History of Calculators |
ARC (ES) | Spanish "Amigos de las Reglas de Cálculo" collectors group |
Barbara Haeblinger’s site (D) | RECHNERLEXICON: a superb information-rich site & largest encyclopedia of Mechanical Computing |
Bill Robinson’s list | Prime reference site for everything to do with slide rules with Hyperbolic scales - see also Hyperbolic Archive search link |
Bob Adam’s site | Collector friend from "Down-Under" with a special interest in Electro & Hyperbolic slide rules - site includes a DB/catalogue of all the known Electro/Electronic slide rule models |
Books & Manuals search | ISRM's library/archive of over 500 downloadable slide rule related books, manuals, instruction sheets, etc |
Catalogue search | Herman's Archive: Herman van Herwijnen's (1929–2004) legacy online catalogue of more than 5000 slide rules & images |
Chris Sangwin’s site (archived) | Many great articles explaining the history and background to slide rules & other mathematical instruments (via Wayback Machine from 2016) |
Clark McCoys’ site | Prime reference site for everything to do with slide rule maker: Keuffel & Esser (catalogues/manuals/etc) |
Colin Tombeur’s site | Juggler/collector with special focus on pre WW2 Faber/F-C slide rules but the site also has some innovative specialised rules (e.g. for juggling) he designed & built |
Daniel Toussaint’s site (F) | LINEALIS: prime reference site for slide rule maker GRAPHOPLEX but also for all kinds of manual calculation instruments |
Dating & Timeline guide | ISRM's handy "one-stop" aid for dating slide rules from various makers |
Dave Hoyer’s site | Prime reference site for everything to do with precision, accuracy and significant digits |
David Green’s site | Prime reference site for everything to do with Planimeters |
David M Riches’ site | Superb collection of mathematical instruments & slide rules. Prime reference site for slide rule maker: Blundell Harling |
David Walker’s site | Novel take on accuracy "Typical Slide Rules Under the Microscope" |
Denis Roegel’s site | LOCOMAT: prime reference site for everything to do with important historical tables |
Dick Lyon’s site | Prime reference site for everything to do with slide rule maker: Carbic & the Otis King calculator (history, models, types, dating, etc) |
Dick Rose’s site (dealer) | Vintage Instruments: collector-friendly dealer with an impressive catalogue of slide rules & much more |
Encyclopaedia of Mechanical Calculating | Rechnerlexikon: rich source of informed articles & patent related information on every possible aspect of mechanical calculating |
Encyclopedia search | ISRM's extensive glossary of slide rule related terms |
Fabrizio Brentini’s site (D) | Prime reference site for almost anything related to maker: A.W. Faber/A.W. Faber-Castell |
Friedrich Diestelkamp’s site | Prime reference site for everything to do with the "big world of small calculators" (Addiatiors) |
George Keane’s site | Prime reference site for the history of slide rule maker "Festus Mfg. Co." and its successor "The Acu-Rule Mfg. Co." |
Gerhard Wenzel’s site | Prime reference site for everything to do with pocket calculating devices |
Giovanni Breda’s site | Cosmopolitan diverse collection of slide rules & mechanical calculators |
Gonzalo Martin’s site (F) | PhotoCalcul: Prime site for slide rules & calculating instruments from French makers GRAPHOPLEX, Lenoir, Tavernier-Gravet & others lesser known (history/dating/catalogues) |
Greg Scott’s site | Greg's Slide Rules: handy site for a range of downloadable manuals |
Herbert Schneemann & Walter Szrek’s (D) | Prime reference site for everything to do with calculating machines |
Hubert van Dongen’s site | Prime archive site for maker: A.W. Faber/A.W. Faber-Castell |
Hyperbolic Archive search | Bill Robinson's Hyperbolic Slide Rule Archive: a 2016 Rod Lovett developed search facility |
Instrument Makers search | Webster Signature Database: compiled by Roderick S. & Marjorie K. Webster the DB is a repository for information about people who made & signed scientific instruments |
ISRG search | International Slide Rule Group: online discussion forum of more than 1700 collectors for slide rules & associated mechanical calculating instruments |
Jeffrey Donovan’s site (archived) | Prime reference site for everything to do with the Sikes Hydrometer (via Wayback Machine from 2014) |
Jim Cerny’s list | Prime reference list for slide rules & slide charts for machining operations, often with the use of a lathe |
Jim Cerny’s site | Prime reference site for everything to do with slide rule maker: Tehnolemn |
John Oakhill’s site | Prime reference site for slide rule maker: Thornton/P.I.C. |
Jorge Fabregas’ site (ES) | ZAZAA: Prime reference site (history/images/catalogues/manuals/patents/cursor evolution/etc) for maker A.W. Faber/A.W. Faber-Castell |
Jörn Lütjens Online Museum | JOM: features an Abacus Museum, a Slide Rule Museum & a listing ARISTO electronic pocket calculators based on Jörn's collection |
JOS literature search | OS Journal Literature Search: version of Rod Lovett's unmissable "Google-like" facility just for PDF versions of the JOS |
José Carlos’ site (ES) | Prime reference site for slide rule maker: ARISTO |
Kees Nagtegaal’s site | Mechanical Calculator: great site for non-electric mechanical calculating devices. |
Kimura Satoru’s site (J) | Prime reference site for Japenese made slide rules |
Klaus Kühn’s site (D) | COLLECTANEA de LOGARITHMIS: prime reference site for everything to do with Logarithms and their spiritual father: John Napier |
KRING (NL) | Dutch Circle for Historical Calculating Instruments |
Landesmuesum site (D) | TECHNOSEUM: Prime reference site for slide rule maker: NESTLER |
Literature search | Slide Rule Literature Search : Rod Lovett's unmissable "Google-like" facility for locating literary sources/references |
Long Scale search | Ed Chamberlain's Long Scale Slide Rule Archive: a 2016 Rod Lovett developed search facility with a smidgin of help from yours truly |
Maker’s compendium | Handy “one-stop shopping” site with links to online information sources for some major slide rule makers - a 2017 Rod Lovett developed facility |
Makers/brand search | Christian Hamann's handy potted history of many slide rule makers |
Martin Brenner’s site | Prime reference site for everything to do with Pilot Balloon slide rules |
Martin Šesték’s site (CZ) | Prime reference site for everything to do with slide rule maker: LOGAREX (also other Czechoslovakian makers) |
Mike Konshak’s site | ISRM: International Slide Rule Museum - a superb information-rich site for everything and anything calculator orientated |
Nathan Zeldes’ site | History of Computing: information packed site featuring many interesting slide rules & other historical computing artefacts |
Net search | Net Search: Rod Lovett's unmissable "Google-like" facility for searching slide rule & calculating related websites |
Nicola Marras site | Calcolatoria Educational Solutions: prime reference site for teaching aids & material to inspire the youth of today |
NSN/NIIN search | National Stock Number/National Item Identification Number: the 9 or 13 digit numbers often found on slide rules commissioned by governmental MoD's, etc |
Oak Ridge Associated Universities site | Prime reference site for everything to do with Radiation/Nuclear slide rules |
OS | American Oughtred Society |
Patent search | ESPACENET: worldwide search facility of the European Patent Office |
Paul Ross’ site (dealer) | The Slide Rule Trading Co.: specialises in selling spare parts but importantly includes the most complete SUN HEMMI catalogue of models & a POST cross-reference table |
Powerhouse Museum | MAAS: Museum of Applied Arts and Sciences in Australia has a varied on-line collection of well catalogued slide rules |
Price & scarcity check | eBay Slide Rule Search: Rod Lovett's unmissable "Google-like" facility for checking the prices & scarcity of all completed slide rule auctions |
Rarities Gallery OS | Rarities Gallery: a collection of images of rare items from the collections of slide rule and calculator enthusiasts hosted by the OS |
Rarities Gallery UKSRC | Rarities Gallery: is a collection of images of rare items from the collections of slide rule and calculator enthusiasts hosted by the UKSRC |
Rick Furr’s site | Prime reference site for everything to do with the Liechtenstein-made CURTA mechanical calculator |
Rod Lovett’s site | Legendary site featuring Rod’s own collection (prime reference site for maker ARISTO) & Herman's Archive but also includes an essential set of search facilities & much more |
Ron Manley’s site | Legendary multi-faceted site for all aspects of slide rule collecting |
RST (D) | German Slide Rule Collectors group but their website doubles as an archive for many interesting articles, meeting reports, etc |
Scale finder | ISRM's reference list (shown graphically) of 75 slide rule scales courtesy of Andrew Nikitin |
Stephan Heimann’s site (D under construction) | Prime reference site for everything to do with Civil Engineering slide rules |
Stephan Weiss’ site (D) | Prime reference site for the history of mechanical (instrumental) calculation with numbers |
Steve Searle’s site (under development) | Steve's Slide Rules: impressive mixture of specialist models & books - particularly the handy is the grouping of specilaist models into trade or profession based categories |
The National Museum of American History | Prime reference site for a wide-range & eclectic mix of mainly American slide rules |
UK Design Reg. & Trade Marks search | The National Archives: "diamond/lozenge shaped" registration marks dating guide and catalogue of design registers/trade marks |
UKSRC | UK Slide Rule Circle |
University of Greifswald site (D) | Extensive collection of digital & analogue calculating instruments including many slide rules |
Walter Shawlee II site (dealer) | SPHERE: The Slide Rule Universe - has a great archive alongside items for sale |