Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 86
hich takes up little space in additionto that occupied by the compass. In the erecting system one reflec-tion takes place at a silver surface and this, together with a relativelylono- light path and large number of surfaces, results in a large absorp-tion of light. An optical system of this type… … ERECTING PRISMS Fig. 79.—Optical system of aiming circle, Model 1916. THE COLLIMATOR. The collimator is an ingenious and inexpensive type of sight occu-pying a position intermediate between the open sight and the tele-scopic. It was used by the Germans and French in a great manyplaces on their…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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