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Welcome to my web site: www.hyperbolicsliderules.com. Here you will find an Article and a Slide Rule List that are devoted entirely to slide rules with hyperbolic scales. For many years I have been intrigued by these wonderful instruments that can deliver such amazing results. You can read the Article and review the List by clicking on the items on the left. I hope you enjoy what you see!

The Article is a revised and expanded version of the one that I had originally written for The Journal of the Oughtred Society (JOS, Vol.14, No.1, 2005). And the Slide Rule List, showing details of the various hyperbolic slide rules that I know about, first appeared on the Oughtred Society’s web site as a Vol. 14, JOS PLUS file.

The Slide Rule List is a continuous working draft of what I hope in time will become a fairly thorough and accurate record of these hyperbolic slide rules. As new information is received the list will be revised to include it. The final goal is to show every known slide rule with hyperbolic scales for each manufacturer. To complete it, I am asking for help from the International Slide Rule Group (ISRG) members, the Oughtred Society (OS) members, and other slide rule lovers to fill in the missing pieces. Please look at both the Article and the Slide Rule List and let me know what corrections and changes should be made. Also, let me know the details for any slide rule that has been omitted from the list and should be added. I will appreciate your feed back, and be most happy to acknowledge the contributions that anyone makes to improve the listing. If you furnish additional details or corrections would you please give the source of your information? Also, if you can send scanned pictures and/or a copy of the manual these would be most helpful. Thanks for any help you may give.

Best regards,
Bill Robinson

Email: wrobinson62@cox.net