NUCLEI IN WET COAL-GAS. 



Ill 



and long after the air and C0 2 nucleations have become stationary in the 

 given apparatus. 



Similarly for the energized gas the increase of nucleation is very 

 gradual and the asymptote is scarcely reached within the interval dp 

 40 cm. of the experiment. All this is sharply in contrast with the rapidity 

 with which air and C0 2 approach their respective asymptotes, as may be 

 seen by inspection of the chart. 



Table 44. Coal gas energized by X-rays at D = 10 cm. and in absence of rays. Two- 

 inch pipes. Lead conveyance tubes. 



1 Coronas too vague for measurement. 



74. New data for coal gas. In case of the above results the large 

 vacuum chamber was not quite filled with coal gas and there may have 

 been diffusion from one vessel to the other. Again, the rubber connecting- 

 tubes of the first experiment (though in advance of the filter) were 

 replaced by lead connecting-tubes, as rubber is pervious to coal gas. 

 Whether from these causes or others, the results came out quite differ- 

 ently after every part of the apparatus had been filled with coal gas. 

 This is also shown in fig. 52 and the results themselves are inserted in 

 table 44. 



The new results for coal gas now conform in character with the data 

 for media of air-water and carbon dioxide-water, and for the non-ener- 

 gized state, the coal-gas line lies between the curves for the other two 

 media, as the figure shows. In like manner the curve for coal gas ener- 

 gized by the X-rays now betrays nothing abnormal. In endeavoring 

 to discover reasons for the differences between the data of table 43 and 

 table 44, the presence of rubber tubing in the former case comes nearest 

 to suggesting a solution. Carbon disulphide emits nuclei spontaneously; 

 whether these may pass through the filter has not been tested; but it is 



A ' > 











