Kinsley — Discussion of Series Dynamo-Electric Machines. 131 



line was then platted showing the relation between n 1 and i, 

 the values of n a determined from the line, from readings of i, 

 would differ from the true \\ by not more than \%. 



The equation of the line of fig. 16 is 



- + - E = n, 



a a 



When R = a constant = 12.23 



? + 35.85-= 18.00 

 b a 



- 4- 48.10 - = 22.00 

 a a 



See p. 118. 



from fig. 16. 



a = 1.945 



6 = 0.635 



1.00 



2.00 



4.00 



3.00 



Fig. 17 



Series Dynamo Surface. Effect of Varying the Speed 

 when the Kesistance is Constant. 



It will thus be possible to determine this relation between 

 Dj, i, and E by any one of the ways given with as great 

 accuracy as the instrument may be read. 



