112 Trans. Acad. Sci. of St. Louis. 



then ( 3 ) will become 



(4) 



E = 



am 



1 + 6i 



The important point to determine now is whether or not 

 our assumptions in regard to the constants <t, G and /jt^ are 

 realized in actual practice. 



Equation (4) can be arranged as follows 



(5) 



E E6 



-^ -\ = a 



ni n 



Let — = X and - = y then 

 ni n 



X -}- yb = a 



is recognized as the equation of a straight line. 



Fig. 3 

 Series Dynamo Constants Determined when the Speed does not Change. 



