84 Magnetic Change of Resistance at Various Temperatures. 



examined, the percentages of nickel being 24, 27*9, 35, 40, 

 44, 48*7, 57, 70. The change of resistance for longitudinal 

 magnetization was measured in the same way as for iron and 

 nickel. The results are shown in fig. 6. All the specimens 











Fig. 6. 













1 



1 



\ ! 



I 





70% | 



•70 



60 

 SO 











$-10* 



/^ 



1 









j 



1 



















1 

















57% 



40 



30 















/ 















| 



















1 

 ■48-7* 



20 

















s 















443 



10 































■-55-5% 

 2.7-9%' H ' 



















100 



200 



300 



400 



500 



700 



800 



Change of Resistance in specimens of Nickel-Steel containing different 

 percentages of Nickel. 



were annealed except the one containing 24 per cent, nickel. 

 This specimen is " irreversible," and after annealing the 

 chance of resistance was too small to be measured. The 

 curves for all the different specimens are very similar to 

 each other. The change of resistance reaches a limiting- 

 value at a field of about 300, and remains constant up to the 

 highest field used. 



The change of resistance for transverse magnetization was 

 also measured for five of the specimens. The wires were 

 wound into flat spirals and placed between the poles of an 

 electromagnet. The change of resistance was measured by 

 means of the slide- wire bridge as described above. The field 

 was measured before the introduction of the wire by means 

 of a ballistic coil. 



The results obtained are shown in fig. 7, the curves for 

 iron and nickel obtained with the same apparatus being added 

 for purposes of comparison. In the specimen containing 

 27*9 per cent, nickel the resistance is apparently diminished 



