A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed J.
Date: 2020 Apr 8, 10:52 -0700
I am looking for instructions for this device and would be grateful if anyone can post a copy or knows how to use this.
[image attached below]
Celestial Slide Rule The celestial slide rule will significantly reduce the effort and time for determining values used in celestial navigation. This quick and easy device is also a great complement to your navigation computer. The slide rule has GHA (Greenwich Hour Angle), LHA (Hour Angle), t (Meridian Angle), SHA (Sidereal Hour Angle) and observers meridian. When two or more of the values are known, the rest can be determined by a single alignment. Diameter: 7". Wt. 2 oz. 7543 Weems & Plath Celestial Slide Rule