A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2019 Oct 10, 17:25 -0700
Here's a few pages on the Weir diagram from the Admiralty Manual of Navigation of 1938. The first page is the description of use from Vol.2. The other pages are the mathematical explanation from Vol.3. This search on HathiTrust that will lead you to these volumes (v2 is really v3 and v.v.):
https://babel.hathitrust.org/cgi/....admiralty+navigation+manual ... end=1940.
PS: HathiTrust is pronounced as if "Hottie Trust".