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 106
tyle is known as the auris. The more elaborate style is called thedictograph and the sensitiveness of the dictograph transmitters andreceivers has resulted in a commercially practical system of telephonywhereby parties can talk to one another without stirring from theirseats or touching the… … Fig. 3,048.—Type R F acousticon suitable for those who lose most of the words in conversingwith one person, even when the voice of the speaker be raised. This type cannot be wornupon the clothing. The transmitters are mounted in a black leather covered case, and whenclosed for carrying, the…
Electrical engineering
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