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The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)

Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 419

An illustration from The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering, 1897, leaf 419 — which the relative Fig. 262. Rumfords Shadow Photometer. intensity of the two lights is estimated by the intensity or strengthof shadows of the same object which they respectively cast. … Fig. 263.A rod is supported in a vertical position. Rumfords Shadow Photometer Arranged for TestingIncandescent Lamps. Back of it is a screen STANDARD ELECTRICAL DICTIONARY. 415 of white paper. The two lights to be compared are arranged infront of the rod and at a little distance from each other.…

Electricity

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