382 Prof. Owens on Thorium Radiation. 



Table IX. 

 Uranium Oxide. Thick layer. 

 Conduction-current with Pressure. 

 Plates 4 cm. apart. Lower plate 95 volts + . 

 One layer of Aluminium foil over active material. 



Pressure in mm. Hg. 



Time of 100 div. in sec. 



Current. 



45 



940 



22-0 



110 



42-0 



500 



150 



33-4 



63-0 



200 



27-4 



77-0 



255 



256 



820 



320 



224 



93-5 



460 



21-0 



1000 



040 



20-8 



101-0 



760 



210 



100-0 



1014 



236 



900 



1266 



26-0 



80-0 



1813 



300 



700 



2332 



33-4 



66 



2786 



34-4 



61-0 



Fig. 11. — Conduction-current with Pressure. 



Uranium Oxide. Thick layer. 1 sheet aluminium foil. 



Plates 4 cm. apart. 



ico 



O 



20 



10 12 14 16 18 20 



Pressure in 100 mm. of mercury. 



