NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Speaking of Verniers, micrometers
From: Norm Goldblatt
Date: 2013 Aug 26, 10:01 -0700
From: Norm Goldblatt
Date: 2013 Aug 26, 10:01 -0700
http://en.wikipedia.org/wiki/Differential_screw
We use these quite often, even though digital versions are cheaper. I post because of the wonderful ingenuity. Precision down to 0.5 micron (wavelength of light) can be attained.
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