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 167
iifflWfii … BAUER* Fig. 3,098.—Diagram illustrating simultaneous telephony and telegraphy. Although in longdistance telephony metallic circuits are used exclusively, it is possible to use single linegrounded circuits for simultaneous telephony and telegraphy. In the diagram two tele-phone stations are…
Electrical engineering
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