THE OPERATION OF THE DYNAMO AS A MOTOR. 115 



Fig. 85^ is a general view of one of 

 the General Electric Company's shunt 

 motor starting rheostats with an auto- 

 matic dead line release, and Fig. 85$ is 

 a complete diagram of the connections 

 of this starter to a motor, and, through 

 a double pole switch and two fuses, to 

 the supply mains. Fig. 85*2 shows the 

 rheostat arm in the starting position, and 

 Fig. 85^ shows the arm in the running 

 position. To start the motor, close the 

 switch, and move the rheostat arm 

 slowly to the right until the block of 



Fig. 85*. 



Fig. 85 . 



iron on the rheostat arm 

 comes against the retain- 

 ing electromagnet, of 

 which the winding is in 

 series with the field wind- 

 ing of the motor, as shown 

 in Fig. 85^. 



Fig. 8 6 is a view of one of 

 the General Electric Com- 

 pany's automatic double 

 release (dead line and over- 

 load) starting rheostats for 

 a shunt motor. The figure 

 shows the rheostat arm 

 in the starting position. 

 This starter is usually 

 connected to the supply 

 mains through a double- 

 pole switch and two fuses. 

 To start the motor the 

 switch is closed, and the 

 rheostat arm is moved 



