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 45
sulated wires twisted into pairs and formed into acable which is protected by a substantial cover. These cables are laced to the frameworkand are carried over a cable runway to the distributing frame. 2.138 HAWKINS ELECTRICITY arm with cords, or a breast plate transmitter and receiver withhead… … Fig. 2,944.—Two position switchboard. A two position switchboard is shown with the backboards removed for repairs and new installation. When properly installed the cables arecarried through the bottom of the switchboard and run through the floor of the building. THE TELEPHONE 2,139 Central Office…
Electrical engineering
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