the Magnetization of Nickel. 137 



Magnetometer-zero .... 505 



Twist. Magnetometer. 



+ 778 



+ 45 845 



+ 90 859 



+ 135 855 



+ 180 852 



+ 135 819 



+ 90 665 



+ 45 555 



528 



- 45 512 



- 90 503 



-135 495 



-180 491 



-135 497 



- 90 502 



-105 (free) 498 



- 45 529 



570 



The behaviour of the wire was far from being cyclic. The 

 wire was therefore subjected to six complete cycles of twisting; 

 thus, 0°, +180°, 0°, -180°, 0°. After this series of opera- 

 tions the magnetometer-readings came to a very nearly cyclic 

 condition, and were as follows : — 



Twist 0°. +180° 0°. -180°. 0°. 



Readings . . 532 585 499 463 537 



Cycle of Tvnsting in Strong Magnetic Field. Field 101*5, 

 load 1-78 kilog. 



Under the action of the coil producing this field the mag- 

 netometer-reading was quite out of range of the scale. The 

 spot of light was therefore brought on the scale b}^ means of 

 a fixed magnet placed at right angles to the plane of the 

 magnetometer-needles, so as not to alter the sensibility of the 

 magnetometer. A series of readings under twist were then 

 taken, as follows : — 



