Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 439
428 MAGNETIC RELATIONS OF THE CURRENT … lever is nob depressed, a spring lY keeps the points apart. Aswitch S is used to connect tlie binding posts, and close thecircuit when the instrviment is not in use. 509. The Telegraph Sounder. Fig. 518 shows the construc-tion of the sounder. It consists of anelectromagnet E, above the poles…
Physics
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