Disappearance of Gas in the Electric Discharge. 229 



great increase in the ionization of the gas, associated both as 

 cause and as effect with the emergence o£ the full thermionic 

 emission. But the measurements recorded seemed at first 

 sight to show that, contrary to expectation, there was no 

 very great increase of ionization at the glow potential, or at 

 least that the increase was not commensurate with that of t he- 

 absorption. The difficulty appears most clearly in observa- 

 tions made with electrodes of the form described in the 

 previous paper (par. 4, loc. cit.), but placed in a vessel o£ 

 about 3 times the volume. 



Fis. 1. 



50 



4-0 



fina) 



30 



20 





{iV 



) chanedz 



p ■ 



ristic in t 

 193 m m. 



V? 









' 





r 



p 



J 













• 2 1 

 c i 



0> 1 



+» 1 



■ 



k ! 





•2 

 -5 

 c 



Q) 







>' 











0) i 

 c | 



1 ! 



8 j 

 ^1 



1 





 



o 



1 





























\0 



20 



30 



\r (volts) 



40 



50 



Fig. 1 shows the relation in this vessel between t and V 

 (the current and potential difference between the electrodes) 

 in nitrogen at a pressure of 0*0193 mm. V^ is the rising glow 



