JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XVI, ARTICLE 12. 



Change of the Modulus of Elasticity in 



Ferromagnetic Substances 



by Magnetization. 



By 



K. Honda, Rigakusld, 

 S. Shimizu, Bigakusld, 



and 

 S. Kusakabe, Rigakitshi. 



With 1 Plate. 



1. It has been generally admitted that magnetization has very- 

 little effect upon the elasticity of ferromagnetic substances. Wertheim^^ 

 measured with a micrometer the elongation of an iron wire due to 

 tension in the mas^netized and unmao-netized states and obtained 

 exactly the same results. Guillemirr^ placed an iron bar horizontally, 

 fixing it at one end, while from the other, which was left free, he 

 huner a small weif^ht. The mat^netization of the bar by a co-axial 

 coil produced a slight raising of the weight. Since there is an 

 attraction between the bar and the coil, when magnetized, the above 

 effect may not be totally due to the increase of the elasticity of the 

 bar ; but to ascribe the effect wholly to the attraction, as G. 



1) Wertheim, Ann. de Chim. et de Fhys. (3) 12, ülO, 1842. 



2) Guillemin, Comp. Rend. 22, 264 and 432, 1846. 



