Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 70
Fig. 66.—Telescope with roof angle erecting prism. … Fig. 67.—Telescope with Brashear-Hastings erecting prism. the common axis. Accordingly, the Brashear-Hastings system has
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
