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 545
with thefaradic current or the negative pole in galvanism, and should on noaccount be employed on the positive pole, as the plating would bestripped; this also applies to gold plated needles, for, it will be recol-lected, gold is subject to the influence of chlorine. Block-tin, platinum, and carbon… … Fig. 4,629.—Mcintosh universalmode. The features of the apparatus are as follows: Dialcurrent selector. A single knob controls the selection of any one of the sixteen dis-tinctive effects secured, all plainly lettered on the dial. The sinusoidal current. Ninevarieties of sinusoidal current may be…
Electrical engineering
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