A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Francis Upchurch
Date: 2016 Jan 16, 07:35 -0800
photos of my latest miniFuller2 with sines and cosines marked in degrees and minutes and generally accurate to 1' except at the "squashed" ends of the scales.
The design format is my own, based on the Otis King which has 2 identical A/B scales(see attached of both for comparison) Mine has that plus sine scale in black with cosines in red going the other way.
This slide rule does all the celnav triangle calculations to 4-7 decimal places, so for me is the ideal general purpose CelNav slide rule.This one is robust and seaworthy too.
I find the simple cylindrical slide rules easy and cheap to build with plastic drain pipe off- cuts and very little precision engineering, other than printing, cutting and lining up the computer generated scales.
Build details on request.