THE CONTINUOUS CURRENT GENERATOR 143 



mined? We have said that motors and generators are 

 reversable in their action and it may be that under special 

 conditions generator No. 2 may not be a generator at all 

 but may be running as a motor, generator No. 1 supplying 

 the necessary power to do this, besides supplying all of the 

 power required by the load. 



In the case of shunt wound generators as shown in Fig. 



smmj 



No. 2 



Generators 



No. 1 



FIG. 91. Elementary Diagram of Station Connections for Shunt 



Generators. 



91 the division of load is easily regulated and may be 

 shifted from one machine to the other by simply manipu- 

 lating the field rheostats. If the external characteristics 

 of the two machines are known, the division of load may 

 be determined at once because of the fact that the terminal 

 voltage of both machines must be the same as they both connect 

 to the same bus-bars. 



Fig. 92 shows the external characteristics of the two 



