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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 590
©T© it … with their accompanying battery and line. When telephonesare used simply to connect two points, there must be locatedat each point a transmitter, a receiver, a batterycell, a means of operating an electric call bellat the other point, and a local call bell. Thisoutfit is usually put up in a set…Electricity · Magnetism
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