Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 59
gure 59. The images pre-sented to the two eyes are different, and entirely unconsciously, as a result of experience, this is inter-preted in terms of relief. The factthat the two eyes receive differentimpressions differentiates the truestereoscopic relief from the reliefobtained by the use of… … Fig. .W.—StPreospopip vision. 1 11 Fig. 59.—Stereoscopic picture. 56 When the distance from an observer to an object exceeds a certaindistance, the angle subtended by the two eyes is so small that the im-ages received by both eyes are sensibly alike. True stereoscopic efTectthen ceases to exist and…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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