Kinsley — Discussion of Series Dynamo- Electric Machines. 123 



II a. 



Series Dynamo and Motor Tests. 



To what extent the foregoing discussion applies to the actual 

 machine can be gotten from the following tests. Even if the 

 equations did not apply the dynamo and motor surfaces could 

 be established experimentally without any regard to their 

 equations. 



Fig. 9 



Series Dynamo Test. Effect of Varying the Speed 

 when the Resistance is Constant. 



The relation between speed and electromotive force was 

 determined for the condition of constant current by twelve 

 series with currents varying between 9.7 and 2.0 amp. using a 

 Wood series dynamo. The speed was gotten by an automatic 

 chronograph record. The line determined with a constant 

 current of 9.7 amp. is given in fig. 9. When the machine 



