Discharge of Electricity through Gases. 

 Fig. 6. — (Pressure 0*4 mm.) 



699 



6C0 



500 



I 400 



o 



a 



r* 300 



200 



100 



A 





~^~— „.>--"""" 







lJ \ 



^ -*""""•"--. 



*~ - — •-'"' 



* A 





0* 



,»-**"*"~* ^ 



v — ~~H\ 



i 





















I 











'• 





500 1000 1500 



Temperature of Cathode, ° C. 



Fig. 7. — (Pressure 015 mm.) 



2000 



1000 1500 



Temperature of Cathode, °C. 





