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 408
V Figs. 3,442 and 3,443.—Incandescent lamps for electric sign lighting. Fig. 3,442, Mazda signlamp; fig. 3,443, carbon sign lamp. The Mazda sign lamp consists of substantial V-shaped tungsten filament, mounted in the regular sign lamp bulb. It burns at an efficiencyof 1.31 watts per candle with a…
Electrical engineering
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