Kl-'FECT Ul' .STKKS« ü\ ."MACIXETIZATIoX. 



21 



Except in weak liclds, llie cyclic cHbcl. {nf,, T),, (Fig. 1<), 

 doited lines) fairly coincides with the initial etlect. Curves 

 (rî/„ //)/ deduced iVoin (o/„ T)„ arc given in Fig. 17, in full lines. 

 In weak fields, they fall steeply and then gradually rise ; as the field 

 is further increased, they slowly tend to apj)roacli the axis of the field. 



NICKEL. 



The efï'ect of applying the maximum tension at once is 

 uearly the same as that of the graduated a})plications of tension. 



The change of magnetization by tension under different 

 initial loadings, where the demagnetization was always effected 

 w^ith the initial load, is given in Fig. 18. and in the following 

 table. The full lines in the figure refer to the initial efï'ect, while 

 the dotted one to the cyclic effect ; the initial and the cyclic 

 effect nearly coincide with each other. As the initial tension is 

 increased, the field of the maximum decrease is displaced toward 

 the higher field. For the same increment uT of 7; ol is in a 

 marked degree less than that in the last experiment. 



