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 548
ncopper, but in cases where the faradic or sinusoidal currents are to beemployed, nickel plating is more desirable. Epilating electrodes or needles are usually of steel, as the negativepole is most commonly employed for this purpose. As a summary it might be said that copper is a very… … Fig. 4,645.—Mcintosh type 12 aseptic porcelained_ plate. Direct current operation. Whenthe plate is employed with direct current lighting circuit, the galvanic and faradic circuitsof the plate are supplied by the direct current; while a motor generator must be em-ployed to transform the direct…
Electrical engineering
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