St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 154
coilof an armature, and the plates, C and Z, as the halves ofa commutator. In this arrangement, it must be noted,the current always flows through the armature coil in thesame direcftion, the rotationbeing kept up by reversingthe poles of the field-magnet. In ordinary simplemotors the current is… … Fig. 232.
Electricity
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