A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 411
illet of photographic paper under similar con-ditions of exposure to a standard light, and thelight to be measured. The combination of pure hydrogen and chlorine,or the decomposition of pure mercurous chloride,have been employed for the purpose of determin-ing the intensities of two lights by… … Fig. 427. The Shadow Photometer. Rumfords photometer, shown in Fig. 427, isan example of this form of instrument. Thestandard candle, shown at L, casts a shadow C,of an opaque rod C, on the screen at B. The light to be measured L, is moved awayfrom the screen until its shadow C, on the screenat A,…
Electricity · Electrical engineering
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