Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 301
eto-eiectric nately approach and recede from a machine. J rr steel magnet. The current thusinduced has high potential. It is used by physicians intreating patients by electricity. Its more common use isfor telephone calls. 269. The Dynamo.—It was early realized that no fieldmagnet, of steel could… … Fig. 189.- ELECTRIC CURRENTS 279 is found to inhere in the iron core of the field magnet.The field thus produced is very weak, but it is not withouteffect. When the armature rotates in this field, very feeblecurrents are set up. These pass into the external circuitand through the coils of the…
Physics
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