Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 549
hotometer.—This consists of a ground-glass screen, in frontof which is fixed an opaque rod (fig. 482) ; the lights to be compared—forinstance, a lamp and a candle—are placed at a certain distance in such amanner that each projects on the screen a shadow of the rod. The shadowsthus projected are at… … Fig. 482 candle, and that thrown by the candle is illuminated by the lamp, the illu-mination of the screen due to each light is the same. The illuminatingpowers of the two sources—that is, the illuminations which they would giveat equal distances —are then directly proportional to the squares of…
Physics
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