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



Or since, if is the absolute temperature 



m 

 q ~2R0> 

 where R is the usual absolute constant, 



we have _ 1_ dq _ 2R dQ 



q 2 dy m dy"* 

 so that 



^r(2 4--) mc d y* 



The coefficient of this result thus turns out to be 



1 2\ \2 + s/m. 



fl-9 



(*+!) 



The importance o£ this result lies in the fact that it has a 

 different sign according as 5 is less or greater than 4. The 

 first example of this type of result was given by Bohr and 

 will be mentioned in the next paragraph, where its import 

 will be discussed. 



There is also a second order effect connected with this 

 phenomenon analogous to the effect of the magnetic field on 

 the electrical resistance in HalPs experiments. In fact, in 

 the absence of the magnetic field the current of heat parallel 

 to the ?/-axis has a density 



dd 



where 7 is the coefficient of the thermal conductivity. 

 When the magnetic field is on and the arrangement is that 

 adopted above, the thermal current in the same direction has 

 a density 



w M ,( 1+ 5) r ( f+ ')*.■!» 



Wy = 7|l+- 



(•+ ! J 



q l-fy 







1 j 

 2qe*l m q* * 

 m 2 c 



r(3+ 



■-.) 



