OF GASES UNDER THE BECQUEREL RAYS. 
5-21 
§ 7. Radiation from Uranium Salt. 
The uraiiluni salt having been jDlaced in the apparatus, the mtes of leak were 
observed at various pressures, with the following residts ;— 
Pressure, 
millims. 
Time taken for 
electrometer needle to 
pass over 100 divisions. 
Current 
(arbitrary scale). 
seconds. 
726 
27-7 
361 
565 
32-6 
307 
372 
44-5 
225 
176 
81-4 
123 
116 
116 
86 
O 100 200 300 400 500 600 700 
Pressure, nun. of Mercury. 
Diagram No. 5, which exhibits these results graphically, shows that for this type 
of radiation the current begins to deviate appreciably from that value which pro¬ 
portionality to the pressure would recpiire, when the pressure only amounts to 
VOL. CXCVl.—A, 3 X 
