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 349
osits, due to the impurities in the carbon, which in time forms anopaque coating on the inside surface of the bulb. When the bulb be-comes thinly coated it should be replaced by a new one. Direct current enclosed arc lamps are made for currents of from3 to about 7 amperes, the usual sizes being 5… … Fig. 3,353.—Adams-Bagnall starting resistance tor series lamp. It is wound on two groovedporcelain spools, substantially supported by a bracket, by means of which it is attached tothe lower part of the case in the back, the resistance being sufficiently removed from thelamp mechanism; it is only in…
Electrical engineering
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