Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 255
Fig. 139. … Fig. 140. that / cannot touch the core of M, nor get too far from it. If a current is passed through M by closing the contact key shown in Fig. 140, M will be magnetized, and / will be attracted, causing C to strike I) with a sharp click. If the current is broken, M is demagnetized, and a spring S…
Physics
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