Kinsley — Discussion of Series Dynamo- Electric Machines. 133 



in that way with no more than two per cent variation of 

 speed. 



Heer von Debrowolsky has done equally well in Germany 

 I do not know of any such installation in the United States 

 but Dr. Louis Bell* has followed Kapp in his solution of the 

 problem. It would of course be more satisfactory to know 

 whether or not the desired results could be obtained before 

 installing and to know also just how to design the circuit. 



The correctness of the method given under la for predeter- 

 mining the operation of a series motor driven as the only load 

 of a series dynamo was examined by means of a small four- 

 pole Wagner Elect. Co.'s series motor and a two-pole Wood 

 dynamo. 



6 0' 



C' 12 15 Current 



Fig. 18 



Series Motor Surface and Dynamo Characteristic 



Predetermination of Motor Operation 



M( 



The characteristic surface of the motor was determined — 

 figs. 11 and 12 give the data and fig. 18 is the surface — and 



* " Electric Power Transmission," p. 86. 



