A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2019 Oct 17, 08:33 -0700
Further tips for constructing a working model Bygrave can be found at http://fer3.com/arc/m2.aspx/Slide-rule-tubes-now-available-Hasper-mar-2010-g12496
These were custom fabricated resin tubes and were used by Wolfgang Hasper, Bill Morris and myself.