A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Fleming
Date: 2015 Feb 22, 15:45 -0800
I have an Atlas Calculator circular slide rule patented 1/17/1922 of very similar design as Hanno's. The spiral scale has an inner opening of 7.3 cm diamete and an outer diameter of 23.5 cm with 20 turns. It is "printed?" on an aluminum base 1/16" thick. It is black and white and thus rather ugly compared to Hanno's work of art.
The scale length is 196 cm more or less.
I inherited this slide rule from my Father-in-Law.