Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 58
GILBERT LIGHT EXPERIMENTS 55 … Fig. 81. You see over your head away: first, becausesome light is absorbedby the mirrors at eachreflection; and, second,because the light hastraveled a long dis-tance in being reflect-ed back and forth be-tween the mirrors. Experiment No. 46.The trench periscope.To illustrate how the periscope…
Light · Scientific recreations
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