130 Travis. Acad. Sci. of St. Louis. 



The equation of the line of fig. 15 is 



1 , . _ Dji « 



When Uj = a constant = 22.2 



I + 3.00 = 1.496? 







1 + 4.00 = 1.821? 







a = 1.915 S = 0.622 



See p. 111. 



from fig. 15. 



These constants differ somewhat from those gotten with 

 the condition of R = a constant. 



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

 determined in the other two cases. The percentage varia- 



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 h 

 were determined with the condition of constant speed, and a 



