Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 57
Fig. 57.—The telescopic system and the eye. more than half a degree. Portions of the image falling on the remain-der of the retina are seen indistinctly. The outer portions serve as afinder to locate objects, after which the eye is turned in its socketuntil the image falls up(m the central portion…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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