430 Drs. Beattie and De Smolan on the Conductance 



The results given for these three gases are comparable to 

 the second series of results given in § 2 for conductance 

 produced in air by uranium. We see that the rate of leak is 

 greater in oxygen than in air. No comparative figures need 

 be given as these would vary according to the voltage chosen. 

 The leakage in hydrogen is less than in air ; in carbonic acid 

 it is less for 4 volts but greater for 90 volts than it is in air. 

 For the latter voltage the leakage in carbonic acid is greater 

 even than the corresponding leakage for oxygen. The 

 appended curves show the peculiarities of the leakage in the 

 different gases (fig. 7). 



Voltage. 



§ 6. Leakage in different Gases at different Pressures due to 

 TJranium. 



The method of filling the glass bulb with any given gas 

 has already been described in § 5. The vacuums up to 

 2 millim. were produced by a double-barrelled air-pump ; 

 higher vacuums were produced by a Topler pump. 



The following tables give the results obtained with the 

 gases we have used :— 



