874 



H. XAOAOKA AND K. H« »NI »A: 



stretched condition. The nickel rod used in all the preceding 

 experiments was also examined. The magnetometer was made 

 sensitive by means of the compensation arrangement, used in the 

 measurement of the effects of hydrostatic pressure. The difference in 

 the magnetization of the rod to be examined and that of the auxiliary 

 rod was first examine! in the unstrained state ; then loading the rod. 

 the difference in the magnetization was again determined : the 

 difference of these two determinations was evidently the effect 

 sought. 



The following table gives the change of magnetization in different 

 fields due to longitudinal stresses (0.19 kg. sq. mm.) and (0.38 kg. 

 sq. mm.). 



[] 



Nick 



The magnetization of iron in the stretched state increases with 

 the magnetizing force till it reaches a maximum in H = 13 C.G.S. 

 nearly ; it then goes on slowly diminishing rill it becomes less than 

 in the free state. 



