38 



Mr. G. Barlow. Effects of Magnetisation [June 18, 



merely^served to eliminate the value of the field near the axis. This 

 method of determining I becomes insensitive when H is very great ; it 

 was therefore found impossible to obtain measurements of the mag- 

 netisation in this case. It is probable, however, that the saturation 

 stage of magnetisation was practically reached within the range of the 

 experiment. 



Fig. 5. 



A 



3 Ni 2 I 



Fig. 6. 



Conclusions. — That for fields ranging from 1000 to 11,000 c.g.s., the 

 value of Ac6 for longitudinal magnetisation in nickel wire is practically 

 constant. This constant value 



A<£ = 0-017 



is greater than the values obtained in the experiments in ordinary 

 fields. 



The results indicated, however, that a slight decrease in A<£ takes 



