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 358
rminals are also con-nected to a two-part com-mutator at the other end ofthe shaft. By reversing theposition of the coil betweenthe pole pieces the brusheswill rest either upon therings or upon the commuta-tor. The electromagnetshave a resistance of 1.3 ohmseach and are to be excitedfrom a source… … •Simple Alternating CurrentDynamo. Direction of current in the coil at one-half revolution from the position in Fig. 307. Brush M is now negative. 5 ohms.When connected as a shunt motor the rectangular coil will makeseveral hundred revolutions with an applied E. M. F. of 4 volts. Exp. 91:…
Electricity · Magnetism
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