Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 196
ce beyond. If the surface be inclined, a largerarea is illuminated. But no more rays can pass throughthe aperture, so that the intensity is diminished. 661. Photometry, The art of measuring the compara-tive intensity of different lights is called Photometry, andthe instruments for measuring,… … Fig. 209.662. Rumfords Photometer, Fig. 209, consists of a screen A, in BUNSENS PHOTOMETER. 187 front of which is placed a black rod B. A candle burning at therate mentioned above is then placed in front of the rod, a little toone side, and the light whose intensity is to determined is placeda…
Physics
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