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 62
throwsbattery in an opposite direction to the return, and causes the coin to drop in the collect box. THE TELEPHONE 2,155 no operator required, it is possible to so connect the instrumentstogether that one can call and talk with any desired party.Many private houses have such systems, with a… … Fig. 2,967.—Automatic selector telephone desk stand with the dial at the base of the instru-ment. By inserting the finger in the dial at the desired number and revolving it until thestop holds it, electric impulses are sent out through the desk stand cords which registercorresponding numbers at the…
Electrical engineering
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