108 



THE DIRECT-CURRENT MOTOR 



CH. V 



total load, as may be seen by drawing the speed curves 

 for two motors with equal induction curves but unequal 

 resistances. If the wheels of the two motors were of 

 unequal diameter due to wear, the motors would draw 

 different currents, but not such as would account for the 



GRAPHIC CONSTRUCTION 



TO FIND THE DIFFERENCE OF INDUCED TENSION 



IN TWO COUPLED MOTORS. 



results actually observed. The difference may with 

 tolerable certainty be attributed to unequal induction 

 curves. 



When two series-wound motors are connected elec- 

 trically in parallel, and coupled mechanically so as to run 

 at the same speed, the induced tension in the two motors 

 will be different if the induction curves are different. 



Let A and B in Fig. 26 represent the two induction 



