A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 643
the mirrorD (Fig. 574) an achromatic prism P ofsmall angle is interposed between D andthe pair of mirrors ml and m2. Thesemirrors are situated one above the otherso that the upper part of the objectoccupies one half of the field of visionand the lower half of the object the other. The mirror D is… … Fig. 573.- -Principle of the range-finder.
Physics
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