Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 85
OEUrCTiVE PRISM OBJECTIVE … .0EYE LENSFIELD LENS ERECTING PRISMS Fig. 7S.—Telescopic system of B. C. telescope. The aiming circle, model 1916.—The optical system shown in figure79 is only used in the aiming circle, model 1916. This peculiar typeof erecting system was probably employed in order that a compact 48918°—21 6 82…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
