to produce Discharges in Gases at Low Pressures. 483 



hydrogen. The others have been omitted in order to avoid 

 making the diagram too complicated. For all the carves, 

 the inner diameter o£ the outer cylinder was 39*6 mm. 



Fia:. 3. 



,tj r% tfC fr^t h*f f^£ fi% 



In fig. 3, curves A and A , diameter of inner cylinder was *2 



t, v » BandB', 



„ „ „ C and C, 



In fig. 4, curves A and A', 



„ „ „ BandB', 



„ ,, „ CandC, 



„ 3-23 . 



„ 15*95 , 



•25 , 



„ 5-10 , 



„ 1595 , 



