Discharge of Electricity through Gases. 

 Fig. 4. 



697 



450 



^ 400 

 o 

 > 



i. 

 & 



W 450 



o 



S 300 



o 



o 



■5 i 



Q 



cV 



D p ^ 









• 











^^ 









^%_ 























~500 ^ 1000 1500 ?000- 



Temperature of Cathode, K, ° C. 

 Fig. 5. — (Pressure = 1*1 mm.) 



800 



700 



I 600^ 



•A 



^ 500 



40C 



30C 



I 1 u- — . : — 



i 



\\ 



1 , . L 



i 



500 C 1000 1500 2000 



Temperature of Cathode, K, ° ( '. 



