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 422
e,j ELECTRIC LIGHTING 2,513 directions, then the me&n value of the lengths of all these linesis the mean spherical candle power. Ques. Define mean hemispherical candle power. Ans. If there be drawn from a source equally in all directions either belowor above the equatorial plane, lines whose… … Fig. 3,456.—Bunsens photometer. The principle upon which this instrument is based isthat a translucent spot in the center of a white screen will have the same appearance as therest of the screen when the illumination on the two sides is equal. A spot in a sheet of whitepaper may be made translucent…
Electrical engineering
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