130 Trans. Acad. Sci. of St. Louis. 



The equation of the line of fig. 15 is 



1 . n,i« 

 b +1=: E 1 



When n, = a constant = 22.2 



See p. 111. 



t + 3.00= 1.496 

 o 



a 



- b + 4 - 00 



1.821 I 



o 



a = 1.915 6 = 0.622 



from fig. 15. 



These constants differ somewhat from those gotten with 

 the condition of R = a constant. 



The dotted line of fig. 15 is one whose constants are as 

 determined in the other two cases. The percentage varia- 



36.0 



38.0 



40.0 



42.0 



44.0 



46.0 



48.0 



Fig. 16 



Series Dynamo Test. Relation between the E. M. F. 

 and Speed when the Resistance was Constant. 



tion is found to be very small. If the constants a and b 

 were determined with the condition of constant speed, and a 



