Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 440
W A B C Earlii FiQ. 520.—Connection of instruments in a telegraph circuit. A, B, and C, and indicates how the coiuiections are made ineacli office. When the hne is not in use the switch on each l^ey K isclosed and the current in the main circuit flows from the positivepole of the main battery at A,…
Physics
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