Identifying enemy planes
During the Second World War, the government established a network of civilian airplane spotters whose duty it was to thwart any Axis sneak attack such
During the Second World War, the government established a network of civilian airplane spotters whose duty it was to thwart any Axis sneak attack such
Aerial Dead Reckoning Computer – E-6B. U.S. Army Air Corps. Made by Keuffel & Esser Co., N.Y. No date, circa 1940-1941. A refinement of the