Brown — The Change in Young' 's Modulus of Nickel. 191 



From the values in Table II, or from the curves in Fig. 2, it will be seen 

 that the behaviour of nickel in transverse fields is the reverse of that in 

 longitudinal fields, that is, Young's Modulus at first increases and then 

 decreases, the maximum (for this constant load) being attained in a field of 

 about 40 units for both the D. 0. and the A. C. fields. 







20 40 80 



Magnetic Field. 



80 



Fig. -1. 



For the D.C. fields the increase is a little over 5 percent, between no 

 field and 40 units, and then a decrease of about 3 per cent, between the 

 fields 40 and 80 units ; and for the A.C. fields the increase is about 3 per 

 cent., and the decrease about 2-5 per cent, between the same limits of field. 



In Table III are given the results with the higher load for direct fields 

 and alternating fields at three different frequencies. 



