Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 106
the other end.Consequently, on looking into therange finder one sees the one markin the upper field, the other in thelower. If prisms A and B actuallydeviate the rays through ninetydegrees, the two bundles of rays en-tering the end prisms of the rangefinder are parallel. Therefore, if therange… … 103
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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