230 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



where E — electromotive force in the circuit, not due to changes in 

 flux, 



Figure 16. [Table XIII.] 

 Back-shearing curves for Bessemer soft steel rod of diameter 1.905 cms. 



N = total magnetic flux of induction through the circuit in the 

 direction of the magnetic lines due to the current C, times the number 

 of turns of wire in the circuit, 



t = time variable, 



C = actual current at time t flowing in the direction in which E 

 acts, 



