Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 99
he target is seen in en-hanced stereoscopic relief due tothe long base AA and superposedupon it are the marks of the reti-cule, each of which appears by vir-tue of the stereoscopic effect at adifferent distance from the ob-server. Near each line the reticulecarries a mark indicating its ap-parent… … 96 In a second type of range finder, the observer sees only a singlemark in the field of view. On turning a roller, as in the ordinary-type of instrument, the mark appears to advance or recede. Adjust,ment is made until this mark apparently coincides with the targetin distance as well as angular…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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