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 iY keeps the points apart. Aswitch S is used to connect tlie binding po3ts, and close thecircuit when the instrument is not in use. 509. The Telegraph Sounder. Fig. 518 shows the construc-tion of th sounder. It consists of anelectromagne. E, above the poles ofwhich…
Physics
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