Z ART. 7. — K. HONDA AND T. TERADA. 



in the same field have been published, and the present investi- 

 gation may also afford interesting materials for testing the validity 

 of these theories. In this direction, we have been preceded by 

 Rensing^^ and Cantone,"' in the case of iron and nickel ; but, a 

 more extended researches, may not be undesirable. With this 

 view, sets of experiments have been undertaken firstly to investigate 

 the change of magnetization by applying successive stresses under 

 constant fields ; and secondly, to investigate the magnetization by 

 applying the magnetizing field under different constant stresses 

 and thence to deduce indirectly the change of magnetization by 

 stresses. 



Specimens used had the following dimensions : — 



§ 1. APPARATUS. 



The intensity of magnetization was measured by the ballistic 

 method ; this method was preferred to the magnetometric one, 

 since in our experiments, fields up to 400 C.G.S. units were re- 

 quired, and consequently the adjustment of a very sensitive 

 magnetometer placed close to a pair of compensating coils tra- 

 versed by a strong current would be extremely troublesome. The 



1) Reusing, Ami. d. Pliys., I«, p. 30,% TJ()4. 



2) Cantone, Rciul. d. 1st. Lonib., (2) 37, ]>. 435, 1904. Ibid. p. 474, 535 and 5G7. 



