118 Prof. T. R. Lyle on the Variations of 



In fig. 5 some of the characteristics of the induction-waves 

 produced in Ring I. for two different speeds are plotted 

 against B x for the purpose of showing the general effect of 

 change of frequency on these characteristics. 



Fig. 5. 



5000 



ioooo B. 



12. For the two rings experimented with I find that I, 

 the total iron loss per cm. 3 per cycle, is given very approxi- 

 mately in terms of 2?, the effective induction; and u the 

 number of periods per second, when $ lies between 1000 

 and 12,000, by a simple formula analogous to that of 

 Steinmetz for statical hysteresis. 



Thus for Ring L, 



I = (-00186 + -000026 n) I© 1 " 57 , 



and for Ring II., 



1= (-001684 + -0000272 n)_ ® l ' w _. 



That the same power of the effective induction should 

 appear in the formula for each ring is striking, and suggests 



