128 
MESSRS. W. R. BOUSFIELD AND C. ELSPETH BOUSFIELD 
Table II. — -Experiment No. 516. 
Calculation of Results. 
1st period. 
2nd period. 
3rd period. 
Duration . 
15 minutes. 
15f minutes. 
15£ minutes. 
m , f start 
0-786 
13-393 
26-438 
1 emperature < | 
13-368 
26-427 
39-411 
Rise of temperature . 
12-582 
13-034 
12-973 
dd/dt . 
0-8388 
0-8409 
0-8370 
Correction intervals . . 
2 2 4 7 
2 3 5 51 
2 ' 6 7i 
T u . 
1-72 3-17 5-64 10-50 
14-50 16-45 19-74 24-26 
27-25 30-61 36-40 
T,. 
1-62 3-30 5-82 10'43 
14-23 16-34 19-70 24-11 
27-27 30-61 36-26 
(T„ - T d ) At . . . . 
0-20-0-26-0-72 0'49 
0-54 0-33 0-20 0-83 
-0-04 1-05 
Correction intervals . 
6 9 
6 91 
9 6£ 
T ob . 
15-3 14-7 
27-9 26-8 
40-3 38-9 
t d . 
3-3 9-6 
15-9 22-4 
30-2 36-7 
(Tob - T d )A/ .... 
117-9 
113-8 
105-2 
fbath . 
- 9-24 
75-53 
46-38 
AQ < obturator . . 
571-82 
551-93 
510-22 
stirring, &c. 
591-75 
173-60 
- 270-01 
Total AQ . 
1154•3 
801-1 
286-6 
dQjdd . 
92 
61 
22 
Ro . 
499-74 
499-86 
499-93 
U . 
186-58 
186-64 
186-69 
60U l~ . 
13346 
13317 
13383 
/ dt 
60U § . . . 
13438 
13378 
13405 
/ dt dd 
the obturator as calculated from the observations for the straight-line intervals on 
the chart. The temperatures T D of the contents of the Dewar vessel are calculated 
from the end values and the times of the short intervals. Table II. also sufficiently 
shows the method of calculation to obtain the result. Experiment No. 516 was one 
of those for determining the capacity, and the final figures are carried to Table III. 
The course of the experiments for the specific heats was precisely the same. 
The whole procedure looks a little complicated, but in reality it is reduced to its 
simplest form. Practically each experiment, covering three periods, took one day 
for the observations and the plotting and calculation of the results. 
