CHANGE OF ELASTICITY BY MAGNETIZATION. 



17 



Cohalt. The cobult l)<'ir av;is too thick, and the luaximuin 

 deflection in the field of the telescope was only 1.5 mm, so that we can 

 not claim for C(3l)alt the same accuracy as in the case of the other 

 specimens. But we notice a distinct increase, as shown in the 

 followino- tal)le and in Fio-.G. 



For cobalt, the de])ression due to the suspended weio;ht is 

 calculated bv the formula, neg^lectino: the weio-ht of the bar itself; 



1 



T^^ 



12- ER^ ' 



where / and R are the length and the radius of the bar respectively. 



Thus the character of the change of elasticity in cobalt is much 

 the same as that in steel. 



7. Nickel. As regards the change of elasticity by magnetization, 

 nickel shows an abnormal behaviour, as already pointed out in the 

 case of the method of elongation. The following table and Fig.7. 

 are the results of observations : — 



