Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 302
lus- trated in Fig.267. As soonas the key A,at Chicago for example, is closed, the currentflows over the line to, we will say, New York.There it passes through the electromagnet m,and thence back to Chicago through the earth.The armature h is held down by the electro-magnet m as long as the key K… … Fig. 20.5. The electric bell
Physics
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