olO K. HONDA : ON THE MUTUAL INFLUENCE 



Since tlie œolotropy of the nickel tube is considerable, the 

 values deduced from tlie circular and the longitudinal magneti- 

 zations are widely discordant with each other and also with the 

 experimental results. But in strong longitudinal fields, the ex- 

 perimental and the theoretical results obtained from the curve of 

 circular magnetization agree fairly well. 



One of the principal causes of the discrepajicy between theory 

 and experiment lies in the fact that in deducing the theoretical con- 

 clusion, I have not taken account of the œolotropy. As I have 

 observed, the intensity of magnetization in a longitudinal direction, 

 when longitudinal and transverse fields, / and t, act simul- 

 taneously, is expressed by kl^ where h is the susceptibility 

 corresponding to the resultant field vl--{-f. Hence a small change 

 in the curvature of the curve of magnetization has a great 

 influence upon the intensity of longitudinal magnetization, and 

 thus it is easily seen that the supposition of isotropy leads to 

 a discordan result. 



In nickel, the field at which the change of longitudinal 

 maonetization bv transverse field reaches the maximum was far 

 greater than in iron. This arises also from the magnetic sus- 

 ceptibility of the nickel tube. By applying a gradually increasing 

 transverse field to n weak longitudinal field, the direction of the 

 resultant field rapidly inclines towards that of the transverse field. 

 Hence under weak longitudinal fields, the magnetization by the 

 resultant field resembles that of the circular field rather than 

 that of the longitudinal. Since the susceptibility of the nickel 

 tube by circular magnetization increases in comparatively slower 

 manner than in iron, the maximum increase of the longitudinal 

 magnetization must recede into higher circular field. Thus the 

 occurrence of the maximum increase of longitudinal magnetization 



