﻿P 1 wt o- Elect vie Fatigue. 



251 



Table I. 



Fresh Electrode. 



Electrode after being 



exposed to light for 



5 minutes at +10 Tolts. 



Electrode after being 



exposed for 5 minutes 



at Zero Potential. 



Time. 



Charge. 



Time. 



Charge. 



Time. 



Charge. 



30 sees. 



GO 



30 sees. 65 



30 sees. 



38 



60 „ 



74 



60 „ 



75 



60 „ 



56 



90 „ 



79 



90 „ 



77 



90 „ 



64 



120 „ 



79 



120 „ 



80 



120 „ 



70 







150 „ 



80 



150 „ 



180 „ 

 210 „ 



74 



77 

 79 



This table and the corresponding curves (fig. 2) show that 

 the rate of charging of the zinc electrode is the same 



Fisr. 2. 



throughout for the fresh electrode, and when it has been 

 exposed to light but maintained at a potential of 10 volts 

 positive. When the electrode was exposed to ultra-violet 

 light at zero potential its rate of charging was diminished. 



or, i 



n other words, the electrode was fatigued. 



