a drum circuit. armature much like that of the Siemens machine. It When the Edison electric circuit is arranged as shown differs, however, from that armature in having an odd in Fig. 3, the conductors to carry the current economi- number of commutator bars and in having an arma- cally must… … mo. When the num- Fig. 2.-THE EDISON DYNAMO. Fig. 4.-EDIS0N THREE-WIRE SYSTEM. ber of lamps between the conductors, 6, c and the shores of the Alpes-Maritimes, at a distance of 18 from the shaft and separated from each other by and c, d, is equal, no current passes along the con- geographical miles…
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