. Electric railways, theoretically and practically treated . Fig. 83. —RELAY BOARD, SPRAGUE Fig. 84.—REVERSER, SPRAGUE SYSTEM. The Sprague System was installed on the ChicagoElevated and the Boston Elevated Railroad, where it hasoperated satisfactorily. It is primarily automatic in it^ TYPES OF CONTROL AND THEIR OPERATION. 133 operation, the motorman simply throwing the controlhandle to the full multiple position, the controller notch-ing up automatically. The current input to motors isregulated by a throttle valve located in the motor circuit,which regulates the motion of a turret mo
. Electric railways, theoretically and practically treated . Fig. 83. —RELAY BOARD, SPRAGUE Fig. 84.—REVERSER, SPRAGUE SYSTEM. The Sprague System was installed on the ChicagoElevated and the Boston Elevated Railroad, where it hasoperated satisfactorily. It is primarily automatic in it^ TYPES OF CONTROL AND THEIR OPERATION. 133 operation, the motorman simply throwing the controlhandle to the full multiple position, the controller notch-ing up automatically. The current input to motors isregulated by a throttle valve located in the motor circuit,which regulates the motion of a turret motor that turnsthe controller cylinder. This system was fully described inthe Street Railway Journal^ Referring to Fig. 82, thesystem consists of the main controller, the reverser, andthe master switch. The resistances are cut out step bystep, as with the ordinary form of control. The variousrelays regulating the movement of the turret motor arerepresented in Fig. 83. This method of making contactis superior to the sliding contact method, and is charac-teristic of the General Electric Control.
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