St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 110
reat tjpes; the continuousor direSl current, and the alternating current dynamo.Direct current machines give out a current which con-stant! j flows in one diredtion, and this is because a com-mutator is used. Alternating currents come from collect-ors or rings, as shown in Fig. 141; and as an… … Fig. 149. is left in the field to induce a slight current in the arma-ture when the machine is started. This immediatelyadds strength to the field-magnets, which, in turn, inducea stronger current in the armature. 131. Winding of Dynamos. There are several waysof winding djmamos, depending upon the…
Electricity
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