A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 410
represent io and iooinches, respectively, the intensity of i, is ioo timesthe intensity I, the standard lght. (5.) Dispersion Photometers. A class of pho-tometers in which, in order to more readily com-pare or measure a very bright or intense light,like that of an arc lamp, the intensity of the… … Fig. 428. Ayrton & Perrys Dispersion Photometer. such an intensity as will permit it to be readilycompared with a standard candle, its intensity isweakened by its passage through a diverging(concave) lens. Ayrton & Perrys dispersion photometer isshown in two different positions, Figs. 428…
Electricity · Electrical engineering
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