. Practical electricity in medicine and surgery. w>%. Fig. 108.—Electric Motor. Fig. 109.—Electric Motor. warmed. These currents are generally small, but, by usingthick and short rods of antimony and bismuth, and by employ- MOTORS AND DYNAMOS. 125 ing many elements, currents of considerable magnitude can beobtained, because in this case the internal resistance of thethermo-electric battery would be considerably reduced. Motors and Dynamos.—We have already given the generaltheory of the dynamo-electric machine (Figs. 108 and 109) onpage 82, on which was explained the production of electro-mo
. Practical electricity in medicine and surgery. w>%. Fig. 108.—Electric Motor. Fig. 109.—Electric Motor. warmed. These currents are generally small, but, by usingthick and short rods of antimony and bismuth, and by employ- MOTORS AND DYNAMOS. 125 ing many elements, currents of considerable magnitude can beobtained, because in this case the internal resistance of thethermo-electric battery would be considerably reduced. Motors and Dynamos.—We have already given the generaltheory of the dynamo-electric machine (Figs. 108 and 109) onpage 82, on which was explained the production of electro-motive force by the movement of a conductor in a magneticfield. It was there shown that if we move a wire near a mag-net, or move a magnet near a wire, an electro-motive force will be established between the ends ofthe wire, tending to urge a currentalong it. It was further shown thatthe tdirection of the electro-motiveforce acting depended upon the rela-tive direction of the magnetic field,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
