A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Swartz
Date: 2020 Sep 3, 13:08 -0700
Seeking manuals and documentation on my Link Sextant Collimator which I use to zero the bubble sextants which I restore.
Before I obtained this instrument, I used the horizon line of Lake Michigan on a clear day at the shore to eliminate dip error as a zero datum for zeroing instruments.
Laying down on a mat at the lake shore in Wintertime Chicago gets somewhat cold.
Patent #2,310,031 G.Lowkrantz, Filed May 15, 1941