Effect of Magnetization on the Permanent 

 Twist of Nickel Wire. 



H. Nagaoka. 



PI. XXXVIII. 



Professor Wiedein;iiin, in a course oï experiments on tlie mutual 

 relation l)2t\veen torsion ;in<l magnetization, found that there was a 

 reciprocal relation between the two. lie found that wliereas torsion 

 changed the magnetization of ir(jn, magnetization, on the other hand, 

 clianged the torsion. To establish the relation between the two, he 

 made a series of experiments, whicli seemed to indicate main^ other 

 intimate relations between the two. Experiments relating to tlie change 

 of twist by longitudinal magnetization have been, so far as I am aw-uv, 

 tried only with iron and steel wires. The curious effect of torsion on the 

 magnetization of nickel has induced me to try experiments in the same 

 line, and find if there also exist simiLu' reciprocal relations Ijetween 

 magnetization and torsi(3n in nickel wires. Want of a])paratus did 

 not allow me to try experiments on the effect of magnetization on 

 nickel wires under different conditions of twist. The present ])aper is 

 confined oidy to the discussion of the effect of magnetization on the 

 permanent twist of ru'ckel wires. 



The apparatus used for twisting the wire and measuring the 

 effect due to magnetization was essenti:dly different from tliat (jf 

 Professor Wiedemann. I employed an arrangement made on the s;nne 

 ])laii as that used ])y Professor F. Kohlrausch* in his ex])erimenis on 

 the torsional elasti«; after-effect of wires. Fig. 1 shows flie front view 



* Poojo'. Ann. 128. 



