Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 281
Fig. 171. … §§ 411-412] USES OF CURRENT ELECTRICITY 267 soft steel, around the end of which is wound a coil c offine insulated wire, thus making it an electromagnet.In front of the magnet is placed a circular diaphragm ofsoft iron, which is held firmly in place close to the endof the magnet, but so that its…
Physics
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