CHANGE OF ELASTIC CONSTANTS OF FEKKOMACJNETICS. 



27 



TABLE XVIII. 



J7"= ±823 gr.fmm!' 



(iii) 70.32 fo Nickel Steel. Figs. 15, 1(3, 17 and 18. 



The change of length by magnetization resembles thut for 

 the former alloy, tliougli the amount of the change is much 

 smaller. Tension always decreases the elongation, the effect being 

 smaller at greater tensions. Though the tension was increased up 

 to sàSôjf/'./mm:-, we could not observe any indication that greater 

 tensions would change the elongation into contraction. The elon- 

 gation seems to tend gradually to zero with the increase of the 

 load. These results are seen in Table XIX and Figs. 15, 16 

 and 17. 



