International Library of Technology · Scranton, International Textbook Co. · leaf 142
about 8,500convolutions, or turns, of insulated copper wire .009 in. indiameter. The total resistance of the wire in the two mag-netizing coils is about 150 ohms. A vulcanized rubber shellor cover c is slipped over eachcoil when wound, to protect itfrom dust and bruises. 2435. Fig. 963… … Fig. 963. The principal disadvan- ELECTRICITY AND MAGNETISM. 1577 tage is the large amount of magnetic leakage caused by anunbalanced magnetic field. There is a large variety of short-range electromagnets adapted to special uses, -but all thevarious types are modifications of the same general…
Electrical engineering
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