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 171
ic induction. 2,264 HAWKINS ELECTRICITY In this case the substituted medium was the ether, that invisible substance which is supposed to fill all space. Last cam<the radiation systems, which also make use of the ether, buin a different way, viz.: by distributing it in such a manner a:to produce… … Fig. 3,100.—Conductivity method. Earth the medium. Steinheil of Bavaria discovered thaithe earth could be utilized in place of the usual return conductor of a wire telegraph lineas here shown. By placing earth plates p p and P, P connected together and havinga galvanometer in circuit parallel with…
Electrical engineering
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