384 Trof. Owens on Thorium Radiation. 



Table X c. 



Uranium Oxide. Thick layer. 



Conduction-current with Pressure. 



Plates 20 mm. apart. Lower plate 95 volts f 



Pressure. 



Time of 100 div. in sec. 



Current. 



15 



10 8 



10'JO 



20 



212 



U40 



IT) 



23 4 



84-0 



35 



21) 



68-0 



45 



35 4 



56 



55 



412 



480 



Fig. 12. — Conduction-current with Pressure. 



Uranium Oxide. I. Plates 2 mm. apart. II. Plates mm. apart. 



III. Plates 30 mm. apart. 



15 20 25 30 35 40 45 50 55 60 65 



Pressure in lbs. per sq. inch. 



