414 Mr. Gk J. Stoney on Polarization Stress in Gases. 



dering would exert if depolarized. P will therefore vary 

 nearly as pT, whence 



(B) 



K (X 



PT 



16. As an example of the application of these app 



roximate 



Y I 





i 





\ 



\ 



\ 



\ 



\ 



\ 



«- \ 



yT*v x 



w ^^W * 





/ ^^. v 





/ 1 nv N 







\ 



/ 1 III r 



v\ 



/ 1 1 



i r^ 



\\ *'u'" 



llfW A 



"T T>^ 



jjfii/i i 1 



• '1 1 I'-M " 



^ p-r*, * 



fil 111 



1 i 







11 



)i 



Dllll! 



X 



formulae, let us plot down on a diagram the value of k, the 

 polarization stress, for various tensions of gas between a heater 

 and cooler at constant temperatures and at a fixed distance 

 asunder. 



Let the abscissas of the figure represent the tensions of the 

 gas. Then the curve Obcd, the ordinates of which represent 

 the flow of heat, is known. The part representing conduction 

 is the parallel line c d; and b c represents the outflow of heat 

 by that modified conduction which may be called penetration, 

 which occurs when the exhaustion has proceeded so far that 

 the number of molecules in a unit tube is less than N (see 



