In German and English. Items for trade with descriptions of condition.

Hyperlinked essay with citations by James Redin covering the rise of the portable calculator and the demise of its predecessor.

A collection of slide rules, with descriptions and pictures. Also, some links to other slide rule sites.

Images grouped by type.

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.

Relates a story about how one person found a giant cache of new-in-box slide rules.

Texts and photographs.

Custom slide rule for sale. Online calculations which cover the same functions available on the site. Manual included with the slide rule.

Assorted slide rules for sale as well as some historical information.

Features some slide rules used in early American and Soviet space programs.