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 379
e satisfactorily, however, for alternatingcurrent, therefore the carbon holders are so constructed that either of those kinds ofcarbon may be used. 2,470 HAWKINS ELECTRICITY Inverted Arc Lamps.—Such lamps are usually arranged tcfeed the negative carbon which is the upper one. The negativecarbon is… … Fig. 3,395.—Exterior view of Toening inverted arc lamp, suitable for use where the indirectsystem of illumination is desired. For the same reason the length of an inverted arc is at leasta third shorter than that of an ordinary arc, for the same voltageand consequently has a diminished efficiency,…
Electrical engineering
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