Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 70
Fig. 67.—Telescope with Brashear-Hastings erecting prism. the common axis. Accordingly, the Brashear-Hastings system has … Telescope with Spreiiger prism. been discontinued in fire-control instruments. Many times a smallopen sight is added to aid in the preliminary directing of the telescope. 67 Figure 68 illustrates the use of the erecting prism shown in figure 24.This prism may be constructed in one piece and is of…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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