542 Mr. G. H. Livens on the Electron Theory 



current of heat in the direction stated is to a first approxi- 

 mation 



m A fl: V s) q dz 



r ( 3+ -J 



the thermal conditions in the direction of x and y axes being 

 uniform. It follows, therefore, by using again 



m 



that 



LV2" 1 " J + N dOJOdz 



2qe [^ . L \2 + sJel M g a * 



HE, 

 ?n L Tn / r ,. z\ mc 



These is also under j? the usual conditions of the experiment 

 no flux of electricity along the direction of the z-axis, so 

 that 



IA2 + J + N dO J 6 dz ' 



It follows therefore that 



f/S-AWfr^Vi 



d* mcR 



(H) 



differ 

 rimeni 



d0 V « 2/ « 



or, if E z is the potential difference observed with the 

 arrangement for Hall's experiment, 



5—4 e 



• E, 



4(s+l) * K E *' 



