Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 195
mankind. It isanother application of the electro-magnet. The equipment of a tele-graph station usually consists of asounder, key, relay, and batteries. The sounder (Fig. 130) gives themessage. The important part of itis an electromagnet. When the cur-rent enters the electromagnet M, the iron… … FIG. 131. — The telegraph key. spring S raises the arma-ture 7 and the bar B. B
Physics · Home Economics
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