tbansactions of the sections. 
53 
die batterj plates, in order to yield the full amount of gas which a battery is capable of 
a ; and at the Royal Institution in the year 18*10 1 showed a voltameter con- 
on this principle, which yielded mixed gas from a battery of four square feet 
twice, at the rate of 110 cubic inches per minute. The volumeterused in the following 
npjfioaits was one winch SI.Gassiot caused to be constructed upon a stt^^estion of 
as«,»ndirhieh consisted of five pairs of plates, each exposing to the other eight square 
iiclwirfnirface. Any number of these plate* could be thrown into action at n time, so 
fiuticluding the outward sides of the exterior electrodes, die sectional area of the 
dnrdjte w^d be 8..8-{'8. , ]6-|- 8, and so on up to 72 square inches. The dimi- 
luiion of the sectional area of the eJectrolyie in iho battery occasioned by the fiorous 
aliiiris ucertaioed first cliargiug a given battery with sulphate of copper without 
■J porous cell, ascertaining the amount of decomposition per minute, and then 
ia the battery the porous cells, which had been previously soahod in tbc siime 
*lwuio of copper,—again decomposing, and calculating from the difference the dimi- 
Btno of area. 
The following table of experiments will explain itself:— 
'•■nfceUi, 
^uBtciad 
leBoyia 
■Bits. 
No. 
united 
in 
qiuntitjr. 
Surface 
exposed of 
battery 
each plate. 
Stuface 
exposed of 
eiectrvdes 
naq.inches. 
Quantity 
of gas in 
cub. in. per 
minute. 
Remarks. 
1 
1 
8 
8 
72 
A trace, 
id. 
2 
1 
8 
72 
32 
8 
1 
Wire. 
6-7 
6 
5-2 
2-8 
0-9 
Battery in these experiments 
charged with nitric acid, sp. gr. 
1-395 sulphuric acid T22, orl+4 
water. 
2 
4 
32 
72 
64 
56 
48 
40 
32 
24 
16 
8 
1 
Wire. 
20*5 
20 *.5 
20*3 
20 
20 
19‘4 
18’8 
16 
12 
3*5 
1 
3 
4 
1 
9 
10 
8 
72 
80 
8 
72 
72 
64 
56 
48 
40 
32 
24 
16 
$ 
1 
Wire. 
7 
58 
65 
G2 
58 
54 
50 
45 
42 
38 
29 
13-5 
1-9 
Battery charged with nitric acid 
sp, gt. 1-39; sulphuric acid, sp. gr. 
1-13, or 1-1-8 water. 
I cannot now recollect my 
son for changing the ^ 
the electrolyte in_coutact withtbe 
zinc.—June 1847. 
1 
8 
8 
_ 8-5 
