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 235
Figs. 3,186 and 3,187.—Single and double wireless receivers. These are not necessarily differ-ent from any head telephone or watch case receiver except that they are constructed soas to be most sensitive. The thinnest ferrotype diaphragms are used and the smallestcopper wire. Where two are used…
Electrical engineering
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