Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 418
measurement at Charlottesburg. The ga;photometric standard used in America are also Vernon-Harcourt pentane flame standards, ancan incandescent lamp of 16 mean horizontal candle-power corresponds to about 16.5 candleas rated by the gas industry. ELECTRIC LIGHTING 2,509 Ques. What is a lumen ? Ans.… … WALL Pig. 3,451.—Diagram illustrating the indirect system of lighting. This system, though some-what extravagant produces pleasing effects. As shown in the cut the lamps are entirely outof sight, and so that the light from the lamps may fall upon the ceiling of the room. Theillustration shows the…
Electrical engineering
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