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 572
power of the lamp in terms of that of the candle, in otherwords, find the candle-power of the lamp. Bunsens grease-spot photometer.—If a piece of plain paper havea spot of oil or grease in the middle of it, the grease spot is moretranslucent than the rest of the paper. On holding the paper upto the… … Fig. 495.—Grease-spot photometer. on placing the eye on the same side of the paper as the source, thespot appears dark on a bright surrounding. In the grease-spotphotometer, the screen, consisting of a piece of cardboard having ahole in it covered with oiled paper, is placed between the two…
Physics
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