MAGNKTlZATluX OF N'lCKEL. 297 



Im giithurLul i'luiu ligures, brief explanations of whieli I siiall content 

 myself with giving 



Fio-. '2-2 --20. 



These illustrate the changes of magnet izatiun in licKl ll.!>. 

 Fig. 24: -27. 



These were obtained in field 13.85. The cm-ioiis transition rur\e 

 Fig. 3U is specially worthy of note. 

 Fig. 1>,S-31. 



These show the gratinai ••Jiangcs of inagnetizati<)n for held 15.78. 

 Fig. 32-34. 

 were obtained in held 23.50. 



Fig. 35-10. 

 were obtained hi field 33.54. 



ibis last was the highest strength of the held at whicli ii was 

 possible td notice the changes of unignetizatii)n. lor the slr<jngor 

 the field the higher is the load necessary to Ijring out the curious 

 change>. The critical load for Helds higher than 33.54 is greater than 

 the tenacity of the wire. 



There is one other point that <-ulls for remark. I'he range of the 

 change of magnetization under feeble stresses begins graduallv to 

 diminish after a <-ertain strength has been reached, so that for a field 

 of 20 or 30, the chaiifi'es of maa;uetization by twistinii" becomes almost 

 inappreciable. This can be accoimted foi- bv the fai.'t that nickel wire 

 whether in the normal oi- twisted eondition behaves practi<'ally the 

 same as regards magnetization in higher fields, indeed, nickel is more 

 easily saturated than iron, so that when .'p = 20 or 30, it is already 

 far beyond the satiu-ation point. Consecjuently the difference in the 

 susceptibilities of nickel in the normal and twisted conditions, to which 

 this alteration of magnetic intensities must be ascribed, becomes less 

 and lcs> marked as the strcu'j'tb of tlie lield i> iui-reased. Man v of 



