* 



. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OP SCIENCE. 





[SIXTH SERIES.] 



DECEMBER 1912, 



LXXXVI. The Effect of Magnetic Fields on Resistance.— II. 

 By C. W. HEArs, Experimental Science Fellow, Princeton 

 University* . 



[Plate XXIII.] 



HMHE former paper on this subject t described experiments 

 JL on the resistance of iron, nickel, cadmium, and Heusler 

 alloy in both transverse and longitudinal magnetic fields. It 

 was there shown that for cadmium (the only metal examined 

 which was not ferromagnetic) the transverse effect was larger 

 than the longitudinal. For the ferromagnetic metals the 

 reverse seems to be the case, though when a large enough 

 transverse field is used there is always a decrease of resistance 

 in these substances {. The experiments to be described were 

 made in order to see whether it is a general rule in all 

 para- and diamagnetic metals for a transverse field to produce 

 a greater effect than a longitudinal ; and as the internal 

 structure of metals is more or less crystalline in nature it was 

 thought that the study of a few natural crystals might be 

 interesting from this view-point. 



* Communicated bv Prof. E. P. Adams. 



f Phil. Mag. xxii. p. 900 (1911). 



X It should have been mentioned that the resistance of iron in small 

 transverse fields was also measured using a solenoid and carefully adjusted 

 specimen, so that there seems to be no ground for Baedeker's suggestion 

 {Elektrisclien Erscheinungen in Metallischeii Zeitern) that this increase of 

 resistance is caused by a longitudinal component of magnetization. 



Phil Mag. S. 6. Vol. 24. No. 144. Dec. 1912. 3 H 



