136 ON POLARIZATION OF METALLIC SURFACES IN AQUEOUS SOLUTIONS. 
The condensers of 311 microfarads capacity consisted of 24300 square feet of metal 
surface, insulated by thin paper and paraffin-wax. 
Table II. 
Two platinum plates in acid and water, each exposing 1 square inch surface. The 
resistance of = 100 Ohms in this Table; by experiment the potential of the two 
cells was found to be reduced 8 per cent., and was therefore very nearly 2 volts instead 
of two cells Daniell’s. 
1. 
Approximate 
potential in 
volts. 
2. 
Time of 
electrification. 
Throw of 
plates 
3. 
image by discharge of 
on raising the key. 
4 . 
Current 
remaining 
after 
discharge. 
5. 
Mean minus 
the current. 
6. 
Ratio of 
capacity with 
different 
potentials. 
7. 
Value in 
microfarads. 
0-2 
55 
0- 4 
55 
0-8 
1- 0 
*1-2 
*1-4 
*1-6 
seconds. 
10 
20 
10 
20 
10 
>» 
j? 
>> 
19 
18 
45 
46 
175 
230 
310 
373 
460 
20 
19 
46 
46 
170 
228 
308 
380 
460 
19 
19 
46 
170 
226 
311 
382 
467 
165 
475 
1 ] 
3 
»J 
1 1 
18 
22 
30 
33 
18 
43 
159 
210 
288 
350 
428 
1 
1-2 
2-2 
2-33 
2-67 
2- 77 
3- 10 
175 
210 
385 
408 
467 
484 
542 
Condensers 
of 311 microfarads. 
0-2 
32 
32 
32 
0 
32 
1 
311 
0*4 
63 
64 
631 
55 
631 
55 
55 
0-8 
127 
127 
55 
127 
55 
55 
1-0 
159 
159 
55 
159 
55 
55 
1-2 
188 
187 
189 
55 
188 
55 
55 
1-4 
220 
220 
221 
55 
220 
55 
55 
1-6 
252 
254 
252 
254 
55 
253 
55 
55 
1-8 
284 
283 
284 
55 
284 
55 
55 
| 2-0 
316 
317 
317 
55 
317 
55 
55 
* The author considers these readings uncertain, having been obliged to guess how much current remained 
after the image had swung out and hack, the momentum of the galvanometer lasting longer than with smaller 
deflections ; the true reading would be greater than those observed. 
