Page:Incandescent electric lighting- A practical description of the Edison system.djvu/72

 at its full capacity; the regulators meanwhile being operated to keep the sides of the system in balance.

The operation of decreasing the output of the station is somewhat similar to the foregoing. The excess of current, as lights are turned off, being taken care of by introducing the resistance of the regulators up to the proper point, and then operating upon the fields of the dynamos, until the current necessary for the lamps in circuit falls to a point where it is expedient to cut out a pair of dynamos.

The couple to be cut out of circuit, have their field-resistance boxes manipulated until they are generating only enough current to keep their pressure up to the proper point to prevent the main current from turning them into motors, when they are thrown out of circuit and the engine driving them is stopped; the other dynamos having meanwhile been so regulated as to divide the total load between them, and this