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 68
e arc. Rheostats should never be used onalternating current circuits for permanent installation as they are verywasteful in comparison with transformers. On alternating current circuits when it is considered that the handfeed arc lamp used requires only about 30 to 35 volts, while the alter-nating… … Fig. 3,868.—Ninety degree or right angle arc lamp. With the 90° setting, the arc can be keptnearer in line with the center of the lenses for a greater length of time, without re-adjustingthe carbons, because of the horizontal carbon being placed in line with the principal opticalaxis and fed…
Electrical engineering
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