NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Chasing tenths of an arc minute
From: Richard Reed
Date: 2010 Mar 12, 13:44 -0800
From: Richard Reed
Date: 2010 Mar 12, 13:44 -0800
NMM has another Ramsden from 1783. This one has 305 mm radius, one scope, and looks to be a nautical instrument with a wooden handle, but I'm not sure whether it caught on. In any case, it has nothing to do with the 20th-century innovation of precision arc hobbing.
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