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 518
9 The intrinsic brilliancy of a lamp is the intensity of the light emitteddivided by the area of the source emitting the light. For example:of two lights of equal candle power the one having the shorter or moreclosely coiled filament and smaller bulb is the more brilliant, and isthe one that will… … Fig. 3,677.—Safety Lighting Co., type F, lamp regulator. It consists of two piles of carbondiscs in series with the lamps; the two piles being in parallel. The pressure on thesecarbons, and therefore their resistance, is determined by the armature of a magnet, the wind-ings of which receive lamp…
Electrical engineering
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