Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 95
pe of prism found in the 1-meter baseinvert-type range finder, as used by the Field Artillery. Two viewsof the prisms are shown. In the first, the different components areseparated in orderthat the differentreflecting surfacesmay be seen moreclearly. The partQ receives the lightfrom the… … Fig. 89.—Ocular prism. the rhomb R are reflected for-It should be noted that one re-flection takes place on the lower surface of S, a portion of which issilvered. It is the boundary of this silvered region which forms thedividing line, the rays which are not intercepted and reflected by thesilver…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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