Bygrave Position-Line Slide Rule

Developed by Capt. L. C. Bygrave after World War I, this British slide rule was the best shortcut method of speeding up celestial computations until Weems invented the Star Altitude Curves and Air Almanac.

Caption:
A shortcut method of speeding up celestial computations.
Type: Artifact
Image Date: January 4, 2013
Credit: National Air and Space Museum, Smithsonian Institution
Origin: National Air and Space Museum, Smithsonian Institution
Creator: Eric Long
NASM2013-00136
Navigators & Inventors
Navigation Methods
 
A shortcut method of speeding up celestial computations.