Cobalt in a Rotating Magnetic Field. 

 Hysteresis Loss in Ergs per cub. centim. per Cycle. 



645 





S" 



5' i. 



p § 



p 



\ /iNi 











\ % 



^a\ 



^, 











^VyJ- ?' 



oX. 

















\ 











\ 









































3 





given in Table L, and exhibited graphically in the curve 

 marked "Nickel" in fig. 2. From this curve it is seen that 

 for an intensity of about 340 C.G.S. units, the hysteresis loss 

 reaches a maximum value of nearly 10,000 ergs per cubic 



