338 H. NAGAOKA. 



creases the m;!<rnetisin, so th;ît it by farther increase of nni^'netiza- 

 hecomes greater than its original tion is so large, that the wire ac- 

 value. (juires greater twist than it ori- 



ginally had. 



It a|)])ears from the readings given above for the changes in 

 permanent magnetism, tliat there is a tendency to a decrease ugain 

 setting in at the higher twists. This suggests that there may be un- 

 twisting in very strong fields, after the wire has been for some time 

 twisting under tlie influence of m;ignetization. The current at my 

 dis])Osa] did not allow me to try ex{)eriments with fields much c)ver 

 400. Up to that limit, the twisting ccjntinued. It still remains un- 

 decided if further increase of magnetizing force gives a maximum 

 twisting, corresponding to the maximum value of ])ei'manent magne- 

 tism obtained by twisting. 



When the subject is viewed from tlie theory of rotating molecular 

 magnets, we fall into difficulties which cannot be easily explained. 

 Professor Wiedemann in coordinating the nnitual relatii^ns between 

 twist and magnetization of iron and steel wires, assumes that the mole- 

 cules are subject to disturl)ances in trying to point tlieir poles in the 

 directicm of magnetization. Drawing an analogy from the effect of 

 mechanical disturbance ap])lied to the twisted wire, he concludes that 

 the disturbance caused by magnetization must untwist the iron or steel 

 wires. This easily ex]>lains the efiect of inagnetization on the per- 

 manently twisted iron wire. It seems (juite ])ro])able that a, similar 

 explariation can be applied to the untwisting observed in nickel wires. 

 The effect of magnetization, however, is not so sim])le in nickel as in 

 iron. It seems very difficult to explain the luaximum untwisting ob- 

 served in nickel. Moreover the disturbance caused in molecular group- 

 ings is not limited to longitudinal magnetization only. Transverse 

 magnetization must likewise produce similar changes am<mg the 



