David Crate's Slide Rules - Assorted slide rules for sale as well as some historical information.
Slide Rule Instructions and Prices. - Instructions on use of slide rules, and a guide to the price of slide rules.
Slide Rule Universe - Extensive on line archive of slide rule information, plus a catalog of available rules.
The International Slide Rule Group at Yahoo! - A community of slide rule enthusiasts. Several hundred posts a month.
Sphere Research's Slide Rule Universe - Online sales and swap meet. Private individuals only.
House of Slide Rules - Large categorised collection with photos and notes.
SlideRule Trading Group - Private trading for members of the group.
Slide Rules and Calculators - Images grouped by type.
Slide Rule Page - Archives of photos of large personal collection.
The Oughtred Society - Membership group dedicated to the history and collection of slide rules.
Slide Rule Collection - Todd Tolhurst describes his collection, some with pictures.
Discovering Slide Rules - Relates a story about how one person found a giant cache of new-in-box slide rules.
Peter Holland's Slide Rules - In German and English. Items for trade with descriptions of condition.
The Slide Rule Guy - Site for Jay Francis, a collector of slide rules and antique mechanical calculators. Items for sale or trade, and many related links.
Sphere Research's Learning about Slide Rules Site - Repository for information, pictures, history and links to sellers, other sites and experts, and an online store.
The Sphere Research Slide Rule Archives - Slide rule model information, pictures, and history from all over the world.
Model Aircraft Performance Slide Rule Calculator - Custom slide rule for sale. Online calculations which cover the same functions available on the site. Manual included with the slide rule.
Space Race Slide Rules - Features some slide rules used in early American and Soviet space programs.
Kung's OnLine Slide Rule Bookmarks - Comprehensive annotated collection of links.
Ted Hume, Slide Rule Trader - Slide rules bought, sold and traded.
Slide Rules from German Manufacturers - A collection of slide rules, with descriptions and pictures. Also, some links to other slide rule sites.
The Slide Rules - A hyperlinked history of slide rules, details of the author's personal collection, and contact information.
Otis King's Patent Calculator - Probably the most complete collection of Otis King's Patent Calculator (cylindrical slide rule) information on-line.
The Death of the Slide Rule - Hyperlinked essay with citations by James Redin covering the rise of the portable calculator and the demise of its predecessor.
Slide Rules - Dedicated to one man's collection of slide rules (and includes a photo gallery), plus a few links for those who want to find out more about them or where to buy one.
HP Museum - Early Calculators - Some non-HP calculators that were introduced anywhere from centuries ago to the late 60's.
Napier's Bones and the Genaille-Lucas Rulers - Presents Napier's Bones and the Genaille Lucas rulers in ready to print forms: Postcript and PDF.
Slide Rules in Thailand - Front and back images of some slide rules for sale.
Slide Rule Trade Offer - An offer to trade kite aerial photographs for slide rules.
Peter Owen, Collector of Slide Rules - Texts and photographs.
IM2001 - 7th International Meeting for Slide Rule and Calculating Machine Collectors - Munich, Germany, September 14 - 16, 2001.
Giovanni Breda's Slide Rule Collection - Giovanni Breda shows his collection. A sheet for each rule is provided including high resolution images. Links to other collector's site are also provided.
Technical Collectibles - Slide rules and planimeters for sale.
Slide Rule Museum - Dedicated to engineers past and present, this collection of slide rules and manuals have in excess of 1000 different items scanned full size and categorized by company or continent. Also offers a comprehensive glossary of slide rule terms and links.
Chris Osburn's Calculating Instruments - Classifies and lists slide rule and scales. Grouped by type, size, country of origin and manufacturer. Articles, a discussion forum and a section on buying and selling.
Slide Rule Emporium - Pickett Slide rules for sale. List style directory of various slide rules with pictures.
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