﻿in Air and Hydrogen at Atmospheric Pressure. 170 



was being used this average charge at first gradually de- 

 creased, but after a few readings became fairly constant. If 

 the strip after being heated for a time was left standing at 

 the temperature of the room for a few hours, then on 

 reheating some of the ions again carried double charges, 

 though the average charge was smaller than with a fresh 

 strip, and the strip came more quickly to a steady state where 

 the average charge was not much higher than the charge on 

 radium particles. (See Table I.) 



Table I. 



Strip at bright 

 red beat. 



Strip at white 

 heat. 



EaBr. 



100 V. 



100 V. 



100 V. 



60 Y. 



100 V. 



pos. 



pos. 



pos. 



pos. 



pos. 



10 



Same strip 



1-05 



1-85 



1-7 



1-1 



after rest of 

 10 hrs. 



1-05 



17 



1-6 



1-1 



1-3 



1-05 



105 



1-8 



1-2 



1-4 



&c. 



17 



neg. 



1-2 



155 



neg. 



neg. 



1-7 



1-3 



1*5 



11 



17 



1-7 



13 



1-5P) 



1-15 



1-6 



1-6 



1/4 



&e. 



1-1 



1-9 



1-8 



1-5 





1*0 



1-8 



18 



1-56 





1-0 



&e. 





1-55 





115 



average 





1-5 





•97 



charge 

 about 





1-.') 





1-15 



1-7 





1-6 





&c. 







&c. 











In the table above is given the value of Q,./Q . from several 

 strips under the conditions indicated. The first throe sots of 

 readings from two strips at 100 volts are shown graphically 



N 2 



