St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 156
Fig. 235. Fig. 236. passes through it without meeting with this opposingcurrent. Fig. 235 shows a starting, stopping, and regulatingbox, inside of which are a number of German-silver re-sistance coils properly connedled to conta<5t-points at thetop. By turning the knob, the field of the motor is…
Electricity
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