An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 591
ore rapidly the bell rings. 359. Telephone exchanges. The use of telephones simplyto connect two points is only a small part of their field of use-fulness. The great majority of telephones are used in connec-tion with a central exchange. This is a place where manytelephone lines center and are… … Fig. 380. — Alternating-cur-rent telephone bell. THE TELEPHONE 527 Every telephone user or subscriber is supplied with a set ofinstruments, and his line is run from the telephone set to asection on the switchboard at the exchange which bears thesubscribers individual number. When one subscriber…
Electricity · Magnetism
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