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 274
severe requirements are illustrated in figs. 3,238to 3,240, which show, in part, desirable construction for medium, heavy,and extra heavy duty bells. Alternating Current Bells.—A type of bell used extensivelyin telephone work, to operate on the alternating current fur-nished by the magneto is shown… … MEDJUMDUTY BELL PATH0FSHUMT0RSHORT CIRCUIT
Electrical engineering
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