CHANGE or ELASTIC CONSTANTS OF FERROMAGNETICS. 



Oo 



irreversible nickel steels were alsu tested after being cooled in 

 liquid air. 



To study the eflect of the amplitude of twist, three different 

 twists were usually applied, differing by about 2.5° from each 

 other. Three or four different tensions were also .applied for study- 

 ing the effect of tension. 



Swedish Iron. Figs. 41, 4'2, 4o and 44. 

 TABLE XXXIII. 



Thus the imperfect annealing did not change its general be- 

 haviour as regards the change of rigidity by magnetization. The 

 amount of the change in the present specimen is, however, about 

 one-half that of the change in the well annealed specimen. The 

 change is almost independent of the tension. The amplitude of 

 twist affects the results in a slight degree ; the change increases, 

 in general, at first slightly and then decreases with the twist. 



The hysteresis for a cyclic change of the field is given in Fig. 



