A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2019 Oct 16, 07:16 -0700
Premade scales and Postscript code for making your own cylindrical or Flat Bygrave are available here http://fer3.com/arc/m2.aspx/Postscript-code-for-making-Bygrave-Scales-Stuart-jan-2015-g29918
Wolfgang Hasper built a working model using these scales http://fer3.com/arc/m2.aspx/MHR1-reproduction-Hasper-mar-2011-g16039 as did Bill Morris http://fer3.com/arc/m2.aspx/MHR1-reproduction-Morris-apr-2011-g16115
A photograph of my own working model MHR1 appears here http://fer3.com/arc/m2.aspx/Working-Model-MHR1-Sliderule-Stuart-jul-2016-g36071 . The scales exactly reproduce the features and idiosyncrasies that are present in the real thing that were painstakingly recorded by Brad Morris.
Copies of genuine Bygrave instruction labels made from images taken by Gary LaPook can be found here http://fer3.com/arc/m2.aspx/Comments-BygraveMHR1-calculations-Stuart-aug-2016-g36219
Further summaries and versions are at http://fer3.com/arc/m2.aspx/Borrowed-Bygrave-Stuart-jan-2016-g34208