Brown — The Subsidence of Torsional Oscillations. 



Table I. 

 Eigidity = 815 x 10 6 grammes per sq. cm. 



From the values in Table I it will be seen that, as in the case of nickel 

 wire, the time taken to attain the maximum fatigue is inversely proportional 

 to the frequency of the applied alternating magnetic field. 



0-4 



0-3 



3 

 •S> 0-2 



o-i 



10 



20 



Minutes. 

 Fig. 1. 



30 



a2 



