CHANCii; OF EI.AsriC COXSTAXÏS OF FERRO .MAGNETICS. 



i:] 



Tn tlio above table, -//" denotes the weight applied or removed 

 lor stud villi;- the elongation of the specimen. 



The coellicient of elasticity first decreases as the field increases, 

 attains a minimum value, whoncc it begins to increase, at first 

 rather abruptly and then gradually. The effect of tension is to drive 

 the field corresponding to the minimum elasticity toward the higher 

 field, and also to depress the absolute amount of decrease. For 

 a weak tension, the elasticity increases by magnetization in fields 

 higher than a certain field at which the change is zero. This 

 field is displaced toward the higher field by the increasing tension. 



The change of elasticity calculated from the effect of tensions 

 upon the magnetic change of length is as follows : — 



TABLE III. 



Curves are also given in Fig. 2 in dotted lines. Comparing 

 the above results with those directly observed, we notice at once, 

 that the general course of the change of elasticity is (juite similar 



