Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 309
ch records the watt-hours on a dial. The armature is very light and delicatelypoised between jewel centres, so that the friction is reduced toa minimum here as well as in the train of wheels. To the lower end of its shaft is rigidly fixed, at right angles, acopper disc which rotates with it in the… … currents, *[ 292, are in- duced in the copper disc,and the reaction of theirmagnetic field tends toretard the rotation. Theamount of this retardingeffect is directly propor-tional to the speed ofrotation. Since theangular force causing thearmature to rotate is di-rectly proportional to themagnetic…
Electricity · Magnetism
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