212 34 



Hveravellir No. 27, Blâhver. 



Sample of gas collected on 23rd. August 1906 at 8.30 p. m. Barometer 

 696 mm. Temperature 37". The volume of the collecting bottle, 198.7 ccm. 



The sample was introduced into the ionisation chamber on 27lh. August 1906 

 at 6.00 p.m. Barometer 703 mm. Air temperature 11° C. 



Measurements of the ionisation: 



Time. 



Hence we get, by means of the curve, the values ot ^, (, : 



\n) 



a'm = 695 



Corrected according to the density of the atmosphere 



/ 1913 1150 



a;„ ^- 695(1+0.215' ,213 ' ^^"'^ ' 



E = 702.6 X 1.347 - 946.4, 



„ _ 1^98^7 649 _ 



^ ~ 1+0.00367x37 ^ 760 ^ ^^^-^ ccm., 



C, = ^ = 6.34. 



The emanation, Cn, from the spring gas is therefore: 



Cii = 6.34 X e'^"''^''-3366 -^ 13 1 pm- gj. uranium per second, 

 / being 336600 seconds. 



