Alternating  Current  on  a  Polarizable  Electrode.      335 
where  ^       R0      AAn4,       7, 
X  =  —  =  0-0244  volt. 
n 
c  —  c0 
is  always  less  than  1. 
The  observed  direct  current  I  corresponds  with  an  E.M.F. 
which  is  the  mean  value  of  p. 
m  Jo 
dt, (5) 
where  W  is  the  total  resistance  in  circuit. 
Therefore 
2tt 
,-^r*{i-(-+D-feM-+D 
+ 
Now 
2tt 
0; 
Jo 
where  p  is  any  integer. 
Therefore 
T- x   <_V?Yi     ? -H-Y-    4_i? 
W\       2W22'1       4\c0/24'1.2 
1/B\6  l"  6.5.4  > 
p 
This  series    is   convergent  if  —  <1.      This  condition  is 
always  fulfilled,  as 
-cos     ??tf  +  -      =  '<  1. 
Co       \  4/         c0 
The  series  may  be  summed,  but  the  summation  is  more 
easily  obtained  by  direct  integration. 
