Alternating  Current  on  a  Polarizable  Electrode. 
;47 
There  is  once  more  to  be  noticed  a  sudden  change  in  the 
neighbourhood  of  frequency  500. 
The  absence  of  any  approach  to  agreement  for  lower 
frequencies  may  be  in  part  due  to  the  fact  that  the  disturbing 
effect  is  of  greater  importance  when  the  frequency  is  low 
than  when  it  is  high.  For  a  given  value  of  the  alternating- 
current  strength,  the  lower  the  frequency  the  more  mercury 
ions  are  required  for  the  current.  On  this  account  the  asym- 
metry of  the  current  itself  may  be  an  important  factor. 
The  following  tables  show  the  direct  current  through 
100,000  ohms  as  observed  for  different  values  of  i0  at  low 
frequencies. 
Table  VI. 
Table  VII. 
Frequency  89. 
Frequency  118. 
Altern. 
Current. 
Direct 
Current. 
I 
to2 
Altern. 
Current. 
Direct 
Current. 
I 
4"' 
amp.  10—5. 
0-93 
amp.  10—5. 
0-038 
4400 
amp.  10-5. 
1-89 
amp.  10—5. 
0-0302 
846 
1-32 
0-0508 
2900 
2-26 
0-0336 
659 
2-28- 
0-0697 
1340 
2-82 
0-0451 
567 
301 
0-0936 
1034 
3-74 
0-0630 
450 
4-65 
01195 
551 
5-54 
0-0922 
302 
5-80 
0-1392 
414 
6-47 
01075 
257 
8-37 
0-1750 
250 
729 
0-1158 
218 
Table  VIII, 
N  =  93. 
Altern.  Current. 
Direct 
Current. 
I 
amp.  10-6. 
4-2 
amp.  10—8. 
34 
1950 
4-67 
4-18 
1917 
5-25 
445 
1615 
61 
5-71 
1535 
70 
6-72 
1372 
8-4 
8-05 
1141 
10-5 
10-88 
887 
i 
From  Tables  VI.  and  VII.  it  appears   that   the    lower  the 
2  A  2 
