THERMAL EFFECTS OF FLUIDS IN MOTION. 
331 
Table IX. — Carbonic acid forced through a plug consisting of 191 grs. of cotton 
wool. Mean barometric pressure 29’6 inches, equivalent to 14’472 lbs. Gauge 
under atmospheric pressure 150-6. Pump placed in connexion with the pipe 
immersed in carbonic acid at 10 h 38 m . 
1. 
2. 
3. 
4. 
5. 
6. 
Time of 
observa- 
tion. 
Volume per- 
centage of car- 
bonic acid. 
Pressure-gauge, and pressure 
in lbs. on the square inch 
equivalent thereto. 
Indication of thermometer. 
Temperature of the bath. 
Indication of thermometer. 
Temperature of the issuing gas. 
Cooling 
effect in 
Cent, 
degrees. 
h m 
10 40 
123-0 
461-5 
189-5 
42 
123-1 
461-6 
187-6 
44 
“X 
123-1"") 
46i-6 q 
187-25"] 
50 
95-51 
53 
123-0 
461-75 
187-5 
55 
123-2 
lbs. 
461-75 
187-45 
57 
>94-58 
123-0 
>122-91=20-43 
461-75 
>461-78=18-962 
187-55 
i>l 87-49= 18-522 
0-44 
59 
122-9 
461-8 
187-55 
11 0 
93-65 
1 
122-6 
461-9 
187-55 
3 
122-6 J 
461-95 
187-6 
5 
122-6^ 
462-0 q 
1 87"55^ 
7 
122-5 
462-0 
188-1 
9 
122-8 
462-0 
188*1 
10 
81-86 
11 
122-1 
462-0 
188-4 
15 
>*76-27 
121-6 
>121-91 = 20-682 
462-2 
>462-11 = 18-976 
188-4 
>188-35 = 18-609 
0-367 
17 
121-7 
462-15 
188-4 
19 
121-6 
462-2 
188-55 
20 
70-68 
121-7 
462-2 
188-7 
21 
121-3 
462-2 
188-65 
25 
121-2^ 
462-2 
188-7 
1 
In the above, as well as in the next series, the carbonic acid contained Q-35 per cent, 
of water. 
2 u 2 
