NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Historical math and astronomy tables, LOCOMAT, 7-place cylindricalslide rule
From: Gary LaPook
Date: 2015 Jun 16, 01:58 -0700
From: Gary LaPook
Date: 2015 Jun 16, 01:58 -0700
Thank you for those links, very interesting stuff but I wish I hadn't followed them so far. I had thought that I was the only person on the planet earth to invent the method of placing the long spiral scale from a cylinderical slide rule on a flat surface but I now have learned that a guy named Billeter has done the same thing with what looks like a C and D scale on a flat surface using a glass plate to hold the top scale. I'd like to say that he had copied my flat Bygrave but he did his in 1887, a few years earlier than my inventiioin. Oh well.."great minds..."
See page 12:
http://locomat.loria.fr/roegel2015billeter/roegel2015billeter.pdf
And mine:
GL
