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 104
e is tested byusing L key. Inside switchboard is tested by using S key. THE TELEPHONE 2,197 The Acousticon.—The most sensitive telephone receiversand transmitters are used in an electrically operated instrumentknown as the acousticon. With this device those who are deafor hard of hearing can be… … Fig. 3,045.—How the dictograph system is used in business; view showing master stationdictograph and several substation dictographs, also long distance telephone. If a tele-phone call comes to an office manager and he desires information from his employees hetalks to them as he would if they were…
Electrical engineering
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