Active Deposits of Radium, Thorium, and Actinium, 
Fkf. G. 
611 
>- 
tft)0 
> 
O 
< 
100 
Hydroge 
N 
o 
— o- 
+ 
+ PoiHsCivc Pole 
Pressure in Mms 
Thorium and Actinium. 
A few experiments made with the emanations from thorium 
and actinium show a rather striking difference in the dis- 
tribution o£ their active deposits in an electric field. 
The experimental arrangement seen in fig, 7 was used. 
Fiar. 7. 
Two thin brass wires 7*5 cms. long and '7 mm. diameter 
were made to lie along the axis o£ a brass tube C 30 cms. 
long and 4*2 cms. diameter. This tube was fitted with a 
small capsule D, into which was placed a small quantity of 
