1033 



4. Discussion of the results. The exceedingly low sparking-potential 

 for argon can be made intelligible by Townsend's theory. ^) According 



Volts 



20000 



15000 



nüDR^LAQarANNINBEN 



ARBDN-aTIKaTGF 



POlTTA'JdO 



10000 



5000 



lOO 90 60 7D 60 50 40 30 20 10 



Fig. 6. 



to him the distance *S (in cms) between the plates at which the 

 discharge passes with a given gas-pressure and poten tial-difTerence 

 is given by 



S={a-^)\og 



G) 



^) See for instance Townsend, Eleclricily in gases, p. 323. 



