Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 509
o to rays emitted obliquely by a luminoussurface ; that is, the rays are less intense in proportion as they are moreinclined to the surface which emits them. In this respect they correspondto the third law of the intensity of radiant heat. 509. Pbotometers.—A photometer is an apparatus for… … Fig. 447. instance, a lamp and a candle—are placed at a certain distance in such amanner that each projects oh the screen a shadow of the rod. The shadows 492 On Light. [509- thus projected are at first of unequal intensity, but by altering the positionof the lamp, it may be so placed that the…
Physics
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