CHANGE OF ELASTIC CONSTANTS OF FEKRO.M AONETICS. 



1Ô 



The change of ehisticity is as follows. Curves are also given 

 in Fiü;, 4 witli full Hues. 



TABLE V. 



J T= ± 638 gr.jjiimr 



/'=8.°4 C. 



Here the general aspect of the change is similar to that of 

 the pure nickel. The amount of the change is, however, far less 

 than in the previous specimen. The effect of tension is also to 

 drive the maximum of the change toward higher fields, but not 

 in such a decided way as in the case of pure nickel. ^loreover, 

 the increased tension increases the amount of the uiaximum 

 change, up to the highest tension employed. These remarkable 

 differences between the pure and the commercial nickel are pro- 

 bably due to the imperfect annealing rather than to the impurity 



