NavList:
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
Seán,
Premade scales and Postscript code for making your own cylindrical or Flat Bygrave are available here https://navlist.net/m2.aspx/Postscript-code-for-making-Bygrave-Scales-Stuart-jan-2015-g29918
Wolfgang Hasper built a working model using these scales https://navlist.net/m2.aspx/MHR1-reproduction-Hasper-mar-2011-g16039 as did Bill Morris https://navlist.net/m2.aspx/MHR1-reproduction-Morris-apr-2011-g16115
A photograph of my own working model MHR1 appears here https://navlist.net/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 https://navlist.net/m2.aspx/Comments-BygraveMHR1-calculations-Stuart-aug-2016-g36219
Further summaries and versions are at https://navlist.net/m2.aspx/Borrowed-Bygrave-Stuart-jan-2016-g34208
Robin Stuart
