40 



AKT. 4. — K. HOXDA Aîs^D T. TERADA. 



TABLE XXV. 



Ko = 0.96 X lo^- 



Nickel. Fio;. 29. 



/=I4°.7 C. 



Among ferromagnetic metals tested, nickel undergoes the 

 îrreatest clianQ;e of ri<>iditv and shows the most remarkable feature 

 as regards the effect of tension. For small tensions, the rigidity 

 at first decreases rapidly and after passing through a minimum, 

 increases slowly with the field. In a certain field, the change is 

 zero, beyond which there is an increase. As the tension is in- 

 creased, the change becomes less for low fields, but greater for 

 higher fields ; the maximum change occurs in a higher field, and 

 its amount increases up to a certain tension, and then slowly 

 decreases. The point of no change shifts toward higher fields, 

 as the tension increases. 



