584 
DE. J. P. JOULE Aim PEOPESSOE W. THOMSOIT OX 
Table V. 
No. of experiment. 
Cubical inches 
of elastic fluid trans- 
mitted per minute. 
Composition of the 
elastic fluid. 
Pressure over that of 
the atmosphere, 
in inches of mercury. 
Temperature of the 
bath. 
Thermal efiect. 
Correction on 
account of conduc- 
tion of heat. 
Corrected thermal 
efiect. 
Thermal efiect re- 
duced to the pressm-o 
of 100 inches of 
mercui-y. 
Ditto, 
calculated for pure 
hydrogen. 
Time occupied by 
experiment, 
in minutes. 
Number 'of observa- 
tions comprised in 
each mean. 
Extreme range 
of the temperature 
of the bath. 
Extreme range 
of the temperature 
of the elastic fluid. 
Extreme range 
of the pressm-e. 
1 
3000 
-1 
r 17-635 Air 1 
L 82-365 H j 
64-1 
6-34 
-6-144 
-0-009 
-0-153 
-6-239 
-6-104 
3 
3 
O 
0 
O 
0 
0 
2 
3000 
' 75-16 Air ' 
24-84 H 
99-86 
6-355 
-0-564 
-0-035 
-0-599 
-0-600 
+0-226 
10 
4 
0 
0-15 
1-5 
3 
3900 
' 4-866 Air ’ 
95-134 H J 
49-91 
6-132 
+0-033 
+0-002 
+0-035 
+0-070 
+0-118 
12 
6 
0-002 
q-06 
1-2 
4 
2900 
\ 
r 78-295 Air 1 
L 21-705 H J 
99-657 
5-808 
-0-535 
-0-034 
-0-569 
-0-571 
+0-525 
34 
12 
0-03 
0-11 
1-85 
5 
2800 
'9-2 Air ‘ 
1 90-8 H J 
86-885 
7-244 
+0-041 
+0-003 
+0-044 
+0-05 
+0-143 
27 
10 
0-034 
0-033 
1-75 
6 
3300 
r 1-798 Air 1 
L 98-202 H J 
79-84 
7-572 
+0-043 
+0-003 
+0-046 
+0-058 
+0-075 
23 
8 
0-008 
0-023 
2-85 
7 
2950 
r 4-795 Air ' 
1 95-205 H J 
74-08 
6-654 
+0-054 
+0-004 
+0-058 
+0-078 
+0-126 
17 
10 
0-016 
0-11 
6-6 
8 
2650 
■< 
r 67-75 Air 1 
L 32-25 H J 
130-97 
6-717 
-0-571 
-0-040 
-0-611 
-0-466 
+0-383 
12 
6 
0-01 
0-07 
2-6 
9 
3800 
r 4-07 Air^ 
[ 95-93 H J 
100-72 
6-781 
+0-039 
+0002 
+0-041 
+0-041 
+0-08 
10 
10 
0-012 
0-078 
2-6 
10 
2700 
r 58-29 Air ' 
L 41-71 H J 
144-02 
6-846 
-0-504 
-0-035 
-0-539 
-0-375 
+0-317 
8-5 
8 
0-011 
0-07 
3-6 
11 
1900 
'91-81 Air' 
[ 8-19 H J 
152-67 
7-406 
-1-002 
-0-099 
-1-101 
-0-721 
+0-904 
9 
8 
0 
0-225 
9-0 
12 
1760 
] 
' 97-56 Ail- ' 
2-44 H 
138-55 
7-474 
-1-032 
-0-11 
-1-142 
-0-825 
+0-814 
13 
8 
0-001 
0-053 
8-2 
13 
3100 
4-375 Air ' 
95-625 H J 
87-74 
88-66 
+0-178 
+0-011 
+0-189 
+0-215 
+0-248 
14 
6 
0-08 
0 17 
4-6 
14 
3300 
6-08 Air 1 
L 93-92 H J 
r 
91-52 
92-951 
+0-081 
+0-005 
+0-086 
+0-094 
+0-132 
18 
8 
0-157 
0-07 
3-2 
15 
3000 
5-043 Air ' 
94-957 H J 
>■ 
73-99 
90-353 
+0-072 
+0-005 
+0-077 
+0-104 
+0-136 
20 
10 
0-18 
0-11 
1-65 
16 
3000 
] 
2-99 Air ] 
97-01 H J 
85-15 
89-242 
+0-111 
+0-007 
+0-118 
+0-139 
+0-159 
42 
15 
0-472 
0-44 
3-2 
17 
2900 
4-13 Airl 
95-87 H 
104-72 
89-858 
+0-073 
+0-004 
+0-077 
+0-073 
+0-098 
15-5 
10 
0-09 
0-035 
6-2 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
RemarJcs on the Tables. 
The correction for conduction of heat through the plug, inserted in column 6 of 
Table I,, and in column 7 of the rest of the Tables, was obtained from data furnished 
by experiments in which the difference between the temperature of the bath and the 
air was purposely made very great. It was considered as directly proportional to 
the difference of temperature, and inversely to the quantity of elastic fluid transmitted 
in a given time. 
The 10th column of Tables II., III., IV., and V. is calculated on the hypothesis that, 
in mixtures with other gases, atmospheric air retains its thermal qualities without 
change. This hypothesis is almost certainly incorrect, since it is reasonable to expect 
that the effect of mixtm’e on the physical character is experienced by each of the con- 
stituent gases. The column is given as one method of showing the effect of mixture. 
Rffect of Mixture on the Constituent Gases . — Although the experiments on nitrogen 
