19 12] Secondary Rays Excited by the Alpha Rays. 189 



Table IX. — Oxygen in Apparatus. 



Carbon electrode at Temp. -192° C. 



Charge on carbon = -84 volts. 



Pressure of air Time from initial Current through Current to 



in apparatus reading 7 minutes magnet polonium 



after starting pump 



.08 mm. 



.013 

 .006 

 .004 

 .004 

 .003 

 .003 

 .003 

 ,003 

 ,003 

 ,003 

 003 

 ,003 



o 



o 



o 



o 



o 



o 



o 



o 



I 



5 

 13 

 19 

 245 



amp. 



Table X. — Hydrogen in Apparatus. 



Carbon Electrode at Temp. 24° C. 



Charge on Carbon = -84 volts. 



