Emanation in the Lower Regions of the Atmosphere. 9 



(3) Exhausted the testing vessel, passed in the contents 

 of b, took the leak : leak=l*l cm. per min, 



(4) Exhausted the testing vessel, passed in the contents 

 of a, took the leak : leak = 4*8 cm. per min. 



Hence we get for Tube A : 



.CY" J "i., 



N 6X >A4-8- 1-0=3-8 J 



The tube had been heated the day before, so taking away 

 •5 for the day's accumulation we get left 3*4 due to the 

 emanation absorbed by A from 635 litres of atmospheric 

 air. 



(5) Exhausted testing vessel twice in succession, refilling 

 with dry air each time. This was to clear out all the 

 emanation due to A (a) . The leak was now high due to the 

 active deposit from the emanation of A(a). The activity 

 of this deposit gradually decayed, and after about an 

 an hour the leak was fairly steady at 1*1 cm. per min. 



(6) Meanwhile heated tube B on the furnace, and collected 

 (a) and (b) as before. 



(7) Exhausted the testing vessel, passed in b : leak = 1*3 cm. 

 per min. 



(8) Exhausted the testing vessel, passed in a: leak=5*3 cm. 

 per min. 



Hence we get for Tube B : 



a . / 1-3-1-1= -2 



1 



U v y-LO — J. J = \4-\ 



B C X W- 



X6 / ^ 5-0-1-1 = 3-9 J 



Take away *5 for the accumulation since yesterday and we 

 get left 3*6 due to the emanation absorbed by B from 

 625 litres of atmospheric air. 



(9) Exhausted testing vessel twice and refilled with dry 

 air each time to clear out all the emanation due to B (6). 



(10) Meanwhile set A and B running for the next day's 

 results *. 



Results. 



The following tables give my results. Owing to the 

 closing of the laboratory at the week-end it was not possible 

 to take more than four daily readings in succession. 



Careful notes were made of the weather phenomena, such 

 as the height of the barometer, the direction and force of the 

 wind, &c, while the experiments were in progress. Most of 



* As this particular set of readings was taken on a Friday, A and B 

 were not set running but were left to stand till the following Monday. 



