CHANGE OF ELASTIC CONSTANTS OF FERROMAGNETICS. 



21 



TABLE XII. 



J T= +816 gr.JDUii. 



Thus, ill the case of iron and steel, relation (3) does not hold 

 even approximately, when the tension is small. But as the ten- 

 sion is increased, the discrepancy becomes less. 



NICKEL STEELS. 



(i) 28.74 ^^ nickel steel. Figs. and 10. 



The specimen first elongates rapidly- and then almost propor- 

 tionally Nvith the field. The effect of tension is generally to 

 depress the change of length. The general feature of the change 

 may be seen in the following table and in Fig. 9. 



