﻿in Gaseous Mixtures by Ronfgen Radiation. 331 



of 15 or 20 per cent, in the values of column 7, with the 

 increased quantity of ethyl bromide. Instead of this it is 

 doubtful if there was an increase of 5 per cent. We are 

 aware that without exact knowledge of the laws of absorption 

 of the corpuscular radiation our conclusions can not be 

 definite. In addition, it is still felt that there may have 

 been incomplete saturation in the mixtures rich in ethyl 

 bromide. Further experiments will be made. 



MLvtures of Ethyl Bromide and various gases. 



A comparison was made between the additional ionizations 

 due to the admixture of a definite quantity of ethyl bromide 

 with various gases. In order to introduce the same quantity 

 of vapour in each case, the gas was slowly bubbled through 

 liquid ethyl bromide, and then through a long spiral glass 

 tube immersed in ice-cold water. The pressure of the ethyl 

 bromide in the emergent mixture was thus the saturation 

 pressure at 0° C., which is 16*6 cm. of mercury. When the 

 mixture of gas at 59*4 cm. pressure and vapour at 16'6 cm. 

 pressure was raised to approximately atmospheric tempe- 

 rature in the ionization-chamber, while the total pressure 

 was still atmospheric, the partial pressures were of course 

 approximately the same. 



The results obtained are tabulated below. 



Table VI. 



Ionizing 

 Radiation : 

 Fluorescent 

 X-radiation 



Gas. 



Length of 

 Ionization- 

 Cbamber. 



Observed 



Relative 

 Ionizations. 



Relative 



Ionization 



corrected 



for 



| 



Ionization ] 



due to 

 Yapour of 1 



(series K) 

 from 



Cu 









Absorption. 



C 2 H 5 Br. j 



Air 



35 cm. 



1 



1 







CO., 





1-5 



1-5 







SH 2 



J9 



101 



12-2 







Air + C a tf,Br 



,, 



73 



7-95 



7-15 





C0 2 +C.,H 5 Br 



,, 



72 



7-95 



6-8 





SH 2 + C 2 II 5 Br 



» 



132 



166 



70 



Cu 



Air 

 H, 



11*5 cm. 



1 



•05 



1 







0., 



n 



1-4 



1-4 







Air+C 2 H-Br 



,, 



603 



8-0 



72 





H + C,H-,Br 



. 



6-25 



7-9 



7-8 





0, + <J.,II-,Br 



» 



6-32 



8-57 



7*5 



Ag 



Air 

 H 



11-5 cm. 



1 



1 





O 





144 



144 





Air + C.JT,Br 





37 



418 41 





ll., + 0.,II,Br 





39'3 



44'3 44-2 





0, + C,[I,Br 



!» 



37*4 



422 411 



