Alternating  Current  on  a  Polarlzable  Electrode.      351 
with  the  same  solution  as  the  first,  and  an  electrical  connexion 
was  made  between  the  two  solutions  by  means  o£  an  inverted 
U  capillary-tube,  also  filled  with  the  solution.  The  E.M.F. 
measurements  were  made  according  to  the  Poggendorf  method. 
The  E.M.F.  is  given  in  terms  of  the  H  electrode  as  0"0  volt. 
It  was  found  necessary  to  polarize  the  electrode  half  an 
hour  to  an  hour  long  before  taking  readings  in  order  to 
obtain  regular  results.  It  was  also  found  necessary  to  keep 
the  alternating  current  small — otherwise  the  condition  of  the 
electrode  appeared  to  be  permanently  altered. 
The  results  are  shown  in  Tables  X.  to  XIII. 
Table  X. 
Anodic  Polarization.     E.M.F.  of  small  electrode  1*7 
volt, 
1 
Freq. 
Altern. 
Current. 
Direct 
Current. 
I 
Freq. 
Altern. 
Current. 
Direct 
Current. 
I 
amp.  10~4. 
amp.  10-7- 
amp.  10~4- 
amp.  10-7- 
1391 
1-81 
2-55 
7-8 
2600 
2-44 
2-45 
411 
206 
3-71 
8-7 
291 
422 
4-99 
2-3;) 
4-82 
8-9 
4350 
2-35 
1-63 
2-96 
1737 
2-27 
315 
6-11 
3-08 
3-90 
4-12 
2-58 
4-58 
6-9 
! 
3-88 
691 
4-6 
2020 
2-26 
2-68 
5-25 
1 
1  1770 
232 
3-12 
5S 
2-66 
424 
6-0 
1 
2-64 
423 
:6-07 
Table  XI. 
Anodic  Polarization.     E.M.F.  of  small  electrode  1*36  volt. 
Freq. 
Altern. 
Current. 
Direct 
Current. 
I 
Freq. 
Altern, 
Current. 
Direct 
Current. 
I 
amp.  10    i. 
amp.  10~7. 
1 
amp.  10  ~4 
amp.  10  —  '• 
2070 
441 
0-104 
0-0536 
3550 
4-62 
5-3 
0-225 
0606 
0-105 
0216 
2620 
505 
0242 
0-095 
559 
0-58 
0-186 
4040 
442 
0156 
o-os 
2990 
511 
5-72 
0-363 
11 
0-139 
0-336  | 
5-17 
593 
0-501 
1-93 
0-188 
0-549 
3340 
502 
0277 
0107 
2100 
406 
0121 
0074 
5-66 
0-783 
0-246 
449 
0-225 
0115 
