St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 107
lines of force to generate a current. A current inside of the machine, as in Fig. 140, would be of no value; it must be led out to external conductors where it can do work. Some sort of sliding contacft is necessarj to connedl a revolving conductor with outside stationarj- ones. The magnet, called… … Fig. 146. EI<ECTRICITY GENERATED BY DYNAMOS. 105 Fig. 141 shows the ends of a coil joined to two rings, X,Y, insulated from each other, and rotating with the coil.The two stationary pieces of carbon. A, B, called brushes,press against the rings, and to these are joined wires,which complete the…
Electricity
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