PROFESSOR DANIELL ON VOLTAIC COMBINATIONS. 
149 
closely with the calculated results of the above Table, whatever combination be taken 
as the foundation of the calculation. 
In the experiments already alluded to, which I performed in conjunction with 
Professor Wheatstone, the cells of the battery used were of the same character as 
the last, but with an efficient length of 20 inches, or 3*33 times greater. The dura- 
tion of each experiment was in this case one minute. 
Upon making the calculations for these, E being = 1, R = 1, e was found = 2-85, 
by comparing the results of five single with those of ten double cells ; and r (by a 
Experiment. 
Cubic inches. 
6 
11 
14 
15-66 
12-25 
20 
17-25. 
These results again exhibit a general accordance with the calculation, but by no 
means so close as the preceding. I was therefore induced to repeat the experi- 
ments with great care. The following Table shows the results, which it will be seen 
closely correspond with those deduced by the formula. 
By a mean of fourteen experiments r was again determined to be in this battery 
1725 R. 
Taking, as before, E = 1, R = 1, and e = 2-49, we obtain from 
mean of seven experiments) = 1757- Hence we find, 
Calculation. 
5 single cells. 
5 - 2-85 
2-13 
Cubic inches. 
= 0-3182 = 7-31 
5 + 1-757 
~ 6-757 
5 double cells, 
5 - 2-85 
2-13 
= 0'505 = 11-59 
+ 1-757 
“ 4-257 
5 treble cells, 
5 - 2-85 
2-13 
= 0-6281 = 14'4 
T + 1 w 
~ 3-423 
5 quadruple cells, 
5 - 2-85 
2-13 
= 0-715 = 16-44 
T + 1-757 
— 3-007 
10 single cells, 
10 - 2-85 
10 + 1-757 
7*13 
“ n-757 
= 0-6081 = 13-98 
10 double cells, 
10 - 2-85 
7 + 1-757 
GO ^ 
T 
(d 
II 
= 1-058 = 24-33 
20 single cells. 
20 - 2-85 
17-13 
= 07882 = 18-55 
20 + 1-757 
— 21-757 
Calculation. 
5 _ <?-49 0.51 Cubic inches. 
5 single cells, 5 +1725 = ^725 = °' 3 7 32 = 8-58 
5 2*49 2*51 
5 double cells, = — " Q95 = 0-5941 = 13-66 
T + 1 '? 25 
Experiment. 
Cubic inches. 
8-875 
13-5 
