Kinsley — Discussion of Series Dynamo- Electric Machines. 117 



n 



E 2 bE 

 ad a 



(16) 



n = 0.00505 E 2 + 0.572 E 



See fig. 5 QS. 



Equations (14), (15) and (16) are the equations of the pro- 

 jections upon the co-ordiuate planes of a line on the surface. 



See fig. 5 OT. 



These curves are decidedly interesting ones, but they will 

 not be discussed at present. 



Fis:. 6 



Series Dynamo Surface. Resistance Equal to 7 Ohms 

 and Resistance Equal to 7.9 Ohms. 



It is important to know how speed, electromotive-force, 

 and current will vary with reference to each other if the 

 circuit is kept constant. 



Then R = a constant. Let R = 7 



(11) 



E = Ri = 7 i 



