204 



example of this mode of representation is shown in Fig. 132, where 

 the current, torque, and slip are plotted against the power supplied to 

 the motor. 



119. Brake Tests. Soames' Brake 



The experiments required for finding the constants which 

 determine the circle diagram may all be carried out with the ex- 



HAND-WHEEL FOR TIGHTENIN5 

 BRAKE 



BRAKE LEVER 



FIG. 133. Soames' Testing Brake. 



penditure of a comparatively small amount of power, and hence the 

 method of testing which depends on the use of the circle diagram is 

 of particular value in connection with motors of large size, when the 



