The Slide Rule Guy Home Page.    The site for my personal slide rule and mechanical calculator collection.

Kung's Slide Rule Site.    Kung's site for collecting slide rules and handheld calculators. Also a very extensive links page to other Internet sites related to collecting slide rules and topics related to slide rules.

David Crate - Slide Rule Collector .    The site for David Crate, a slide rule collector. Currently he has some slide rules for sale. And a solution to the "KERCS" problem.

Dave K - The nerdiest hobby going .   

Clark McCoy    - great site on K&E catalogs.

Dennis Farr    - personal slide rule collection.

The Slide Rule Trading Co.    Paul Ross sells slide rules, parts, cases, books and ephemera with emphasis on Hemmi and Frederick Post products.

Nathan's Possibly Interesting web site    Nathan is a physicist turned computer engineer, and a collector and evangelist of the history of computing.

   Commercial Sites

The Rational Past.    The Rational Past. Laboratory, Medical, Nautical, Surveying, Calculating, Drafting, Weights, Measures, Scales, Astronomical, Optics, Meteorological, Industrial, Agricultural, Tools of the Trades and Other Items of Unique Interest.

The Slide Rule Universe.    The Slide Rule Universe. All kinds of slide rules for sale. A large selection.

PerryGraf Slide Charts Inc.    The original manufacturer of custom slide charts and wheel charts.

Datalizer Slide Charts Inc.    Datalizer Slide Charts is a manufacturer of custom slide charts, wheel charts and point-of-purchase displays.

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   Research Sites

Post Research.    The Post Slide Rule Research Article. This article was the result of 2 years of extensive research and investigation conducted by Paul Ross and Ted Hume. Excellent work.

Hemmi Catalogue Raisonne.    On-line listing of every Hemmi slide rule that had a model number between 1912 and 1975, when Hemmi went out of the slide rule business.

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   Clubs and Organizations

United Kingdom Slide Rule Circle .    The UKSRC exists to promote interest in slide rules.

The Oughtred Society.

The Oughtred Society dedicated to the history and collection of slide rules

The Oughtred Society was formed in 1991 to serve the needs of the growing number of slide rule collectors. From a nucleus of 11 charter members in June of 1991 the Society has grown to become a worldwide organization with over 300 members. The Society establishes a journal twice a year, publishes a swapsheet twice a year, prvides a membership directory, and sponsors an annual meeting of collectors. Membership privileges include the ability to purchase back issues of The Journal. The Society has become a valued network for contact and exchange among slide rule collectors.

The Oughtred Society is a non-profit tax-exempt educational organization.

Annual dues are as follows: Domestic (US): $35.00 International: $40.00

To join, simply send a check for the appropriate amount along with your name and mailing address to:

Wayne Lehnert
Secretary of the Oughtred Society
P.O. Box 99077
Emeryville, CA 94662

The International Slide Rule Group on Yahoo,    The 900 member group list on Yahoo.