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 573
ame time two mirrors A and B (Fig. 495) are placed one on eitherside of the screen. Expt. 116.—Grease-spot photometer. Make a similar set of readingsto that described in Expt. 115. In this case adjust the grease-spot screenuntil the appearance of both sides is the same. Reduce the readings inthe… … Fia. 496. -Lummer-Brodhuii photo-meter. determinations do not give constant value for the candle-power of thelamp. A much better form of photometer is the Lummer-Brodhun,shown in Fig. 496. Light from the two sources Sx and S2, to becompared, falls on the sides A and P of a milk-white screen. The…
Physics
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