THE INDUCTION MOTOR. 



379 



Instructions. The instruments and connections required 

 will be the same as those given in the connections for 

 Experiment L. In this case, however, both voltage and 

 periodicity of the supply are to be maintained constant, 

 The motor must be provided witty a brake on its pulley, 

 or must be coupled to a generator which has been 



1500 



1450- 



20 



15 



10 



1350( 



oo 



1000 



4000 



2000 3000 

 Watts output. 

 FIG. 185. LOAD CURVES OF INDUCTION MOTOR. 



5000 



previously calibrated, so that it may serve as a brake or 

 absorption dynamometer. The power given to a 

 generator employed as load in this way will be the 

 measured output of the generator divided by the efficiency 

 of the generator at this output. 



* For a description of a very convenient form of eddy-current brake for 

 such experiments, see paper by Dr. D. K. Morris, read before the Birmingham 

 section of the Institution of Electrical Engineers, April, 1905. 



