Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 459
further advantage which is gained by the Zeiss binocular is due tothe fact tliat the two objectives are separated by a distance which isgreater than the distance between the eyes, so that the stereoscopiceffect is more prominent than with the unaided eye or with the ordinaryopera glass.* 462. The… … Fit;. 438. A parabolic reflector this has been found best to make ships appear at their true distancesfrom the submarine. There is no stereoscopic effect, since the periscopeis not double like a binocular. 463. Parabolic reflectors. For the projection of a more nearly cylin-drical beam than is…
Physics
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