Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 257
capacity ofthe line. These systems of telegraphy,although in common use, are too com-plicated to explain here, but if the stu-dent desires, he can look them up inbooks of wider scope or in technicalworks upon telegraphy. 388. The Electric Bell.—The electricbell (Fig. 144) consists of a… … §§388-389] INDUCED CURRENTS 243 which holds it away from the poles of the magnet, the endof the spring being pressed against the end of the contactscrew C. p and p are binding-posts to which the wiresfrom the battery are attached, ^is a contact key or push-button. When ^is pressed, the current…
Physics
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