2!tS 



11. .NAt-i.VOKA 



the features of iiiiiyiietizatinn ciirvo arc ((iiite siiii|>ly accniiiitcd I'ni- liy 

 this consideration. 



It i.s very difficult to detcniiiuc the exact loading ut whicli llic 

 reversed phenouieaou of reverse ])olarity makes its appearance in 

 various fields. Assuming, however, that within small ranges of load. 

 the decrea.se in the intensities of magnetization is pro])ortioual in 

 I he aiiMiunt of loading, 1 ohtaiiicd tlu' following values for the stress 

 wliich must he applied so as to etlect tlie reversal of polarity ol' the 

 particular nickel wire placed in various fields : — 



I'ur .0 = 



= / / 



^ 217 



=--. 121 



= iy'A 



= 78:J 



^: 1120 



= J 220 



= 1Ô^5(I 



^ 2110 



= 2830 



Plotting the curve with .'>> for ahscissa and M' f jr ordinate, we 



"et the annexed tifjure. 



W 



:iO(X) 



lioUO 



ir>oo 



luuo 



10 15 -Ji' 



:!(i :t5.V> 



