DISCHAEGE FEOM METALLIC SUEFACES IN DIFFEEENT GASES. 451 
the electrometer quadrants corresponded to a deflection of GSM divisions. A capacity 
of 240 centinis. was placed in parallel with the electrometer. The standa,rd showed 
that no appreciable alteration occurred in the intensity of the light during the course 
of the observations. The results given in this table are plotted in fig. 10. 
Ihe results of two sets of observations taken after substituting a platinum 
electrode for tlie zinc are given in Tables VIII. and IX., and the corresponding 
Fig. 11 . 
curves in figs. II and 12. 
separating tlie platinum and 
apparatus was used, and the distance 
The huge leak 
gauze was 2 millims. in each case. 
Table VIII. 
1 
i 
' Potential to whicli 
^ l^atinum is charged 
; in cells. 
(1 cell = 2-1 volts.) 
I 
Current from platinnm surface in electrometer 
scale divisions in 15 seconds in— 
Air. 
IL-. 
CO 2 . 
51 millims. 
51 millims. 
51 millims. 
I 20 
41 
43 
69 
I 60 
60 
65 
86 
100 
71 
80 
99 
! 140 
— 
100 
i 180 
91 
138 1 
1 
127 
ISote. 1 volt P.I). between the electrometer quadrants corresponded to a 
deflection of G8 divisions. 
3 M 2 
