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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: The Bygrave
From: Douglas Denny
Date: 2009 Aug 5, 06:44 -0700
From: Douglas Denny
Date: 2009 Aug 5, 06:44 -0700
You have lost me. The scale in the pdf file appears to be logTan to me (or, if you wish -as marked, logCotan which is the same as logtan inverted, so divisions per degree are the same in either case) and is, as expected, extended at the 0 degree and 90 degree ends with the minimum divisions per degree at 45 degrees. For use with a Bygrave slide rule a logCosine (or logSecant)is needed; (separately). Douglas Denny. Chichester. England. --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
