/ *\r 



THE 

 LONDON, &DINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE, 



[SIXTH SERIES/) V <„ \ 



il/A J" 1921. 





-Var* r c^lC 



LXII. T/i£ Disappearance of Gas in the Electric Dis- 

 charge. — II. By The Research Staff of the Genera! 

 Electric Company, London *. ( Work conducted by N. R. 

 Campbell.) 



Observations on Different Gases. 



IN the first portion of this paper (Phil. Mag. xl. p. 585, 

 Nov. 1920) there were discussed (1) the electrical con- 

 ditions in which gases disappear from a discharge-tube with 

 a hot cathode, (2) the chemical actions involved in the dis- 

 charge, especially those connected with the disappearance of 

 carbon monoxide. We shall now consider the disappearance 

 of other gases and the destination of the gas that disappears. 

 It has been found that some of the minor conclusions under 

 (2) of the previous paper are erroneous ; consequently, 

 carbon monoxide will be included again among the gases to 

 be discussed. 



12. Hydrogen. — Langmuir, in a very complete investi- 

 gation |, has shown that hydrogen will disappear from a 

 vessel containing a hot tungsten filament, even when no 

 discharge passes through the gas. The disappearance takes 

 place even when the temperature of the tungsten is as low as 



* Communicated by the Director. 



f I. Langmuir, Journ. Amer. Cliem. Soc. xxxiv. p. 1310 (1912). 



Phil. Mag. S. 6. Vol. 41. No. 245. May 1921. 2 Z 



