﻿358 Mr. A. Fleck on the Condensation of 



shown in fig. 12, and are to a certain extent similar to the 

 pair of curves shown in fig. 6. There is, however, this 

 difference, that consecutive points in the former experiment 



He. 12. 



-ISO 



■>p 



■/yd' 



-120" -/W -/60" -/go" 



Pol n Is for radium <NYf short n lh u 

 • - •• thorium ... v. — X—X 



Curves obtained for mixed radium and thorium emanations in 

 exhausted tube (fig. 9). 



lie on the same curve, but in this latter consecutive points 

 may lie on either. The curves of set A are roughly parallel 

 to but from 7 to 10 degrees lower than those of set B. 



Repetition of this exjieriment. 



A second experiment which was made was mainly concerned 

 with an endeavour to repeat the previous observations with 

 regard to the proportional decrease in the quantity of emanation 

 condensed as time went on. The /3-ray electroscope remained 

 in its former position, but the small 7-ray one was placed 

 close to the P 2 5 end, so that the total amount of emanation 

 condensed in this end could also be determined. 



Another quantity of radium emanation was sealed in the 

 tube, and the determination of the quantity of emanation 

 condensed by liquid air was made every third day. Only 

 one experiment was made for a higher temperature, and it 

 confirmed the previous result that radium emanation was 

 apparently more easily condensed than the thorium emanation. 



