[SATTERLYj 



PARTIAL CONDENSATION 



113 



in the capacity of G due to the accumulation of the small quantity of 

 condensate. The graph between pressure and number of collectors 

 should be a straight line. Now this straight line was never obtained. 

 If it had been the percentage of noncondensable gas in nitrogen, 

 helium, etc. in the natural gas could have been calculated at once 

 from x = 4/3p. 



Resîdts 



Fig. 2 shows the graphs obtained with some samples of natural 

 gas. H refers to the gas from the pipe line at Hamilton, used by 

 Satterly, Patterson, Burton and Dawes in their experiments on the Pro-" 

 duction and Purification of Helium from Natural Gas. It was the first 

 gas experimented on in Canada or elsewhere for commercial manu- 

 facture of helium. M H refers to the gas from the Cousins & Sissons well 

 at Medicine Hat, V refers to the gas from Viking, and BI (1) and (2) 

 to the gas from the Pipe line at Bow Island and CW to the gas from 

 the Walker well at Calgary. With the exception of the Hamilton gas 

 these samples were collected by Professor McLennan in the spring of 

 1916. 



Fig. 3 gives similar curves from the gas at Petrolia, Texas, col- 

 lected by myself in October, 1917, using new and old liquid air and 

 from the natural gas at Hanmer, New Zealand, sent by Mr. McLaurin, 

 the Dominion Analyst. 



The quoted analyses of these gases are : 



It is evident from the curves that the pressure does not mount 

 linearly. The inference is that some of the nitrogen dissolves in the 

 methane. The condensate in some cases is a clear liquid. This was true 

 for most of the Ontario gases examined. In the case of the gases from 

 Western Canada, the condensate was usually a white solid. This was 

 also true for the gas from Petrolia. Several of the gases from New 

 Zealand gave also a white solid which melted to a milky liquid 

 showing presence of considerable quantities of carbon dioxide. 



