584 Prof. F. T. Trouton and Mr. S. Buss on the Rate of 



Table III. 

 4 Partitions exposed. 



Time 



in Minutes. 



Deflexions of Electrometer. 



Shutter kept 

 closed. 



Shutter moved in 

 by cam. 



Shutter kept 

 open. 



i 



14-5 



15-9 



1(V5 



16-8 



16-9 



16-92 



16-88 



16-80 



16-7 



16-5 



16-35 



16-2 



12-1 



121 



1205 



12-1 



12-3 



12-3 • 



t 



103 

 8-05 

 60 

 40 

 2-5 

 1-45 

 •60 

 •01 



l 



i 



3 



] 



1£ 



1| 



If ..... 



2 



2i 







2h 



2|...... 



3 



* 









to come out of the condenser in the ordinary unrestrained 

 way, no correction being made for surface leakage. The 

 middle curve was obtained with the cam in action, and the 

 bottom curve with the pla*e Q fully exposed the whole 

 time, thus showing how the Residual Charge immediately 

 begins to leak across the gap between the two parallel 

 plates P, Q. 



The plate Q, upon which the uranium fluoride was spread, 

 was divided into six partitions which could be separately 

 covered with metal sheets, thus varying the surface over 

 which the leak took place. 



Fig. 5 was obtained with -J partition exposed. 

 Fig. 6 ,, ,, 2 partitions exposed. 



Fig. 7 ,, ,, 4 partitions exposed. 



From the foregoing curves it was seen that the shape of 

 the cam was approximately correct as it maintained the 

 deflexion of the electrometer constant. 



Now since the difference of potential between the coatings 

 of the condenser was constant, the rate the Residual Charge 

 was coming out of the condenser at any moment (and passing 

 across the space between the two parallel plates) was propor- 

 tional to the area of the bottom plate exposed. This, in turn, 

 was proportional to (L^— OS), where L f is the length of the 

 radius vector of the cam which at any moment passes 

 through H, and OS is the length of the radius vector when 



