Magnetization and Magnetic Change of Length. 659 

 Nickel-Steel 24*04 per cent. (cont.). 



^=531° C. 



*=586° 0. 



*=-717° 0. 



£=604° C. 



H. 



I. 



H. 



I. 



H. 



I. 



H- 



I. 



41 

 184 

 370 

 490 



1-9 



7-9 

 137 

 16-2 



101 



268 

 487 



34 



7-7 

 11-5 



124 

 348 



487 



4-6 

 10-0 

 121 



64 



236 

 411 

 489 



34 



77 



11-3 



12-9 





t=502° C. 



*=274° C. 



^=193° C. 



*=11°-3C. 



H. 



I. 



H. 



I. 



H. 



I. 



H. 



I. 



79 

 250 

 392 



487 



30 



9-0 



11-9 



13-8 



50 

 151 



352 

 487 



2-8 



7-7 



141 



166 



34 

 102 

 310 

 494 



1-8 



5-7 



12-9 



165 



57 

 165 

 286 

 484 



28 



8-9 



13-8 



18-9 



From these values, the temperature-curves of magnetization 

 are obtained and drawn in figs. 7 e, /, g, h, i, j, k. In these 

 figures, we have included the results obtained in the first and 

 second series of experiments. 



Here we also notice that, except with 28 '74 per cent., the 

 magnetizability of these alloys had considerably changed by 

 the heating and cooling which the alloys had undergone since 

 the first experiment. Hence in some of the figures, the 

 portions corresponding to the first series o£ experiments were 

 displaced parallel to themselves so as to form closed curves. 

 Thus the displaced portions are given in dotted lines. 



As the temperature gradually rises from — 186° C, the 

 magnetization of 29*24 per cent. Ni diminishes at first slowly, 

 then rapidly, and after passing through an inflexion point, 

 the diminution becomes slow. The curve passing through a 

 second inflexion point begins to descend very rapidly, as the 

 critical temperature is approached. If this temperature be 

 passed, the diminution of the magnetization by heating is 

 very small, so that the curve is nearly parallel to the axis of 

 temperature. From the course of the curve, it seems probable 

 that the magnetization does not altogether vanish till the 

 melting-point of the specimen is reached. As the temperature 

 is next gradually reduced, the increase of magnetization is 

 very small ; this state continues till the temperature falls to 

 about 100° C. • then the increase becomes very rapid. For 

 example, in H = 400 c.G.S., the intensity of magnetization at 



