Mutual Relations between Torsion and Magneti- 

 zation in Iron and Nickel Wires. 



By 



H. Nagaoka, Rigaknliahtshi, 

 Prufe.s^-ur uf Applied IMatheinatics, 



and 



K. Honda, Rigakushi, 

 Po.<t-gradiiate in Physic.?. 



WÜh Plate XVI. 



The various effects of stress on the magnetization of ferro- 

 magnetic metals are of such a complex character that no simple 

 relation seems to exist among them. The strains caused by mag- 

 netizing the ferromagnetics are of no less complex a nature, so that 

 the co-ordination of these two classes of complicated phenomena 

 is, up to the present, still a matter of doubt. Various isolated 

 facts, such as the analogies between the change of magnetization 

 by longitudinal pull and that of length by magnetization, the 

 relation between the twist caused by the interaction of longi- 

 tudinal and circular magnetizations and the circular or longi- 

 tudinal magnetization produced by twisting a longitudinally or 

 circularly magnetized wire respectively, were long considered as 

 affording a clue to the explanation of these phenomena. So far 



