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 350
att per candle power with clear globes. Ques.lamps? How are the carbons arranged on enclosed arc ELECTRIC LIGHTING 2,441 Ans. The lower cafbon is usually fixed in the bulb, and theupper carbon slides down upon it by gravity. For quiet operation, the gap must be about three-eighths inch wherethe… … m :V.- i- m sVERY LIGHT PURPLERED HOT LOWER PURE CARBON Fig. 3,354—Enclosed carbon alternating current arc. Electrode life 100—125 hours; arc about% inch long and requires 70 to 80 volts; electrode ends nearly flat. There is drawn nomarked crater and less light is produced per watt. moderate…
Electrical engineering
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