. Electrical news and engineering . Fig. 3. bars of copper, insulated one from another. If we had not a com-mutator, just a plain ring, we would then have an alternating cur-rent, but with the use of the commutator we straighten the cur-rent so that it will flow in one direction. Field magnets F is an iron core on which is wound many turnsof fine wire, so that when part of the current of the machine passesthrough this wire it will magnetize them ; and the more currentwe pass through this wire the stronger will be the magnetism ofthe pole pieces. The brushes B are either copper or carbon. *Pape
. Electrical news and engineering . Fig. 3. bars of copper, insulated one from another. If we had not a com-mutator, just a plain ring, we would then have an alternating cur-rent, but with the use of the commutator we straighten the cur-rent so that it will flow in one direction. Field magnets F is an iron core on which is wound many turnsof fine wire, so that when part of the current of the machine passesthrough this wire it will magnetize them ; and the more currentwe pass through this wire the stronger will be the magnetism ofthe pole pieces. The brushes B are either copper or carbon. *Paper read before Hamilton Association No. 2, Fig. 4. to the other brush. To regulate this inachine, we move handle ofrehostat so as to put more or less resistance to the current flowingin field magnets. This rehostat is composed of a number of coilsof German silver wire, which has a high resistance to the cur-rent, and by moving the handle of rehostat we put a greater orless length of this wire in the field wire, therebyvaryi
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