142 
MR. DANIELL ON VOLTAIC COMBINATIONS. 
whilst of the high temperature produced by the disengagement of heat during the 
mixture, which was about 110°; and the following series of experiments will show 
the great increase of action which followed this accession of heat, and its rapid 
decline with the temperature. The observations were made at intervals of two 
minutes ; but I have added the calculated rate per five minutes to facilitate compa- 
rison with former experiments. 
Time. 
Interval. 
Voltameter. 
5 min. rate. 
h m 
12 52 
/ 
Cubic inches. 
Cubic inches. 
12 54 
12 59 
2 
8-8 
22* 
12 61 
1 3 
2 
8- 
20“ 
1 5 
l 7 
2 
7*3 
18*2 
1 9 
1 11 
2 
7* 
17'5 
1 13 
1 14 
2 
6'5 
16-2 
1 16 
l 17 
2 
6" 
15' 
1 19 
2 
5-7 
14-2 
1 21 
2 
,4-8 
12° 
Wishing to follow up this indication of the influence of temperature, I caused u 
tub to be made which would just receive the ten cells of the battery standing upon 
small blocks of wood, between which there was room for the syphon tubes to pass. 
In this situation it was fresh charged with the acid solution ; and henceforth I care- 
fully noted the temperature, which in this instance was 68°. Its action was steady 
for three quarters of an hour at 13"8 cubic inches per five minutes. Two fluid ounces 
of fresh standard acid were then poured into the inner cells, and the tub was filled 
with hot water of the temperature of 130° to nearly the top of the cells; the action 
was now found to be 20 cubic inches per five minutes. The temperature of the exterior 
solution of sulphate was 106°, and of the interior acid 100°. The experiment was 
terminated by the bursting of all the membranes which had been exposed for five 
weeks to the acid solution. 
Having remounted the battery, I proceeded to ascertain the effect of different 
charges in connection with this decided influence of temperature ; and, in the first 
place, having poured a plain aqueous solution of sulphate of copper into the exterior 
cells, I filled the interior with pure water, making use at the same time of fresh 
amalgamated zinc rods. At the commencement of the experiment the temperature 
was 74° ; and there was no appreciable decomposition in the voltameter. The tub 
