METALLIC SURFACES IN AQUEOUS SOLUTIONS. 
135 
Table I. 
Two platinum bulbs about 075 inch in diameter in diluted sulphuric acid. 
Owing to the large resistance (1000 Ohms) used in 11 and lb the actual potential is 
uncertain in this experiment, because the conduction across the fluid reduces it. 
1 . 
Potential in 
terms of a cell 
of Daniell's 
battery. 
2 _ 
Duration o 
electrification 
in seconds. 
3. 
Swing of reflecting galvano- 
meter by the discharge of the 
bulbs on raising the key. 
4. 
Current after 
magnet came 
to rest. 
5. 
Mean minus 
the remaining 
current. 
6. 
Mean divided by 
potential and 100 
to give relative 
capacity for various 
potentials. 
7. 
Approximate 
capacity in 
microfarads. 
0-02 
10 
Ol 
* 2 
Ol 
^2 
Ol 
* 2 
Ol 
il 
2 
1 
348 
95 
20 
ol 
Ol 
24 
2-1 
»J 
0-04 
10 
41 
4 i 
41 
4 ! 
55 
4 
1 
95 
0-06 
10 
6£ 
61 
61 
61 
55 
6 
1 
99 
0-1 
95 
10 
20 
HI 
11 
HI 
12 
111 
11 1 
:} 
1°4 
1-05 
365 
0 * 1 G 
95 
10 
20 
18 
18 
171 
18 
18 
18 
» } 
l 6 f 
1-09 
379 
0-2 
10 
24 
24 
24 
ifd 
95 
20 
24 
24 
24 
il > 
224 
M2 
390 
55 
30 
24 
24 
24 
„ j 
0-4 
10 
59 
58 
58 
2 fi 
55 
20 
58 
57 
58 
H V 
551 
1-39 
484 
59 
30 
58 
58 
57 
„ J 
0-6 
10 
105 
1054 
104 
„d 
55 
20 
105 
104 
105 
„ d 
1041 
1-74 
606 
95 
30 
104 
105 
103 
» J 
0-8 
10 
164 
163 
162 
162 
3 1 
55 
20 
162 
162 
1 6 1 
„ d 
159 
1-99 
693 
55 
30 
162 
162 
1 6 1 
„ J 
1-0 
10 
230 
235 
230 
230 
5 d 
55 
20 
232 
231 
230 
231 
» d 
226 
2*26 
786 
59 
30 
231 
231 
- J 
1 * 2 * 
30 
318 
320 
314 
14 
303 
2-53 
880 
1-4* 
30 
440 
446 
451 
23 
426 
3-04 
1057 
f 
30 d 
1 - 6 * \ 
30 
about 
603 .. 
41 y 
562 
3*5 
1218 
1 
52 J 
Table I. (continued). 
Condensers of 311 microfarads. 
Potential in terms 
of a cell of 
Daniell’s battery. 
Throw of image by 
discharge of condensers. 
Mean. 
Batio of capacity 
with different 
potentials as observed. 
Value in | 
microfarads, j 
0-02 
H 
H 
H 
11 
1-03 
311 
0-04 
3 
3 
3 
3 
55 
0-06 
41 
41 
H 
Al 
2 
55 
59 
0-08 
6 
6 
6 
6 
95 
0-10 
7 i 
71 
71 
71 
55 
59 
0-20 
14i 
144 
141 
141 
1 
55 
0-40 
29 
29 
2 »i 
29 
99 
0-60 
43 
434 
44 
434 
55 
55 
0-80 
58 
58 
58 
58 
95 
1-00 
724 
73 
73 
73 
55 
59 
1-60 
116 
116 
116 
116 
59 
55 
2-00 
143 
143 
143 
143 
55 
95 
* Last three readings doubtful, the current remaining after the discharge being considerable. The true 
reading would be greater than indicated. 
