Electrical Resistance of Nickel in Magnetic Fields. 655 



with a nickel strip Knott observed no increase o£ resistance 

 In the lower transverse fields. He attributes the discrepancy 

 between his results and those of Grunmach and Heaps to the 

 difference in width in the direction of the magnetizing force. 



Efr. 3. 















f x I0 3 



.^o^ 





Having obtained the transverse position, a similar series 

 •o£ curves was taken for the longitudinal position. As was 

 to be expected, the curve with the least fall was obtained for 

 tthe position 1^°. This curve is given in fig. 4. Curves 







Fig. 4. 







f x I0 3 









/^~ 















.10 



i 



\ 







10,000 



15,000 



were taken for rotations of 1° about this position both in a 

 vertical and in a horizontal plane. No curve with less fall 

 was obtained after repeated experiment with different speci- 

 mens. It will be noted that the change of resistance attains 

 a maximum in a field of about 3000 c.G.s. The fall at 

 1 0,000, reckoned as a fraction of the maximum increase, is 

 about ^g. As far as can be judged from the published 

 curves, Heaps' fall at 10,000 is about ^ r - This result thus 

 affords a confirmation of that obtained by Heaps, the fall at 

 10,000 being slightly less than that obtained by him. This 



2X2 



