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 174
ry and an induction coiloperated by a Morse telegraph key, and the vibrations induced in theparallel wire were noted by means of a telephone receiver. Similar induction systems were used by several other experimenters,but in none of them did the electromagnetic pulsations exceed 300 persecond, so… … Fig. 3,103.—Inductivity method. By placing two coils of many turns with their axes parallelto each other and connecting in series with one a battery and key, and joining the end ofthe other to a telephone receiver, the make and break of the key causes the electric energyto be transformed into…
Electrical engineering
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