68 
MR. JOULE ON THE MECHANICAL EQUIVALENT OF HEAT. 
Table I. (Continued.) 
No. of experiment 
and cause of change 
of temperature. 
Total fall of 
weights in 
inches. 
Mean 
temperature 
of air. 
Difference be- 
tween mean of 
columns 5 and 6 
and column 3. 
Temperature of apparatus. 
Gain or loss of 
heat during 
experiment. 
Commencement 
of experiment. 
Termination of 
experiment. 
24 Radiation ... 
0 
60-157 
i-l60 
58-977 
59-017 
0-0°40 
gain 
24 Friction 
1263-94 
59-811 
0-505 
— 
59-017 
59*595 
0-578 
gain 
25 Radiation ... 
0 
59-654 
0-061 

59-595 
59*591 
0-004 
loss 
25 Friction 
1263-49 
59-673 
0-185 
+ 
59-591 
60-129 
0-538 
gain 
26 Radiation ... 
0 
59-156 
0-609 

58-541 
58-554 
0-013 
gain 
26 Friction 
1263-49 
59-333 
0-488 
— 
58-554 
59*137 
0-583 
gain 
27 Friction 
1263-99 
59-536 
0-198 

59-054 
59*623 
0-569 
gain 
27 Radiation ... 
0 
59-726 
0-101 
— 
59-623 
59*627 
0-004 
gain 
28 Friction 
1263-99 
59-750 
0-155 
+ 
59-627 
60-183 
0*556 
gain 
28 Radiation ... 
0 
59-475 
0-102 
+ 
59*585 
59*569 
0-016 
loss 
29 Friction 
1263-31 
58-695 
0-182 

58-230 
58*796 
0-566 
gain 
29 Radiation ... 
0 
58-906 
0-108 
— 
58-796 
58*801 
0-005 
gain 
30 Radiation ... 
0 
59-770 
1-286 

58-454 
58-515 
0-061 
gain 
30 Friction 
1263-99 
60-048 
1-223 
— 
58-515 
59-135 
0-620 
gain 
31 Friction 
1263-49 
59-343 
0-022 
+ 
59-091 
59*639 
0-548 
gain 
31 Radiation ... 
0 
59-435 
0-198 
+ 
59*639 
59*627 
0-012 
loss 
32 Radiation ... 
0 
59-374 
0-357 

59*015 
59*020 
0-005 
gain 
32 Friction 
1263-49 
59-407 
0-105 
— 
59*020 
59*585 
0-565 
gain 
33 Radiation ... 
0 
59-069 
0-201 

58*867 
58-870 
0-003 
gain 
33 Friction 
1263-49 
59-234 
0-081 
— 
58-870 
59-436 
0-566 
gain 
34 Friction 
1262-99 
56-328 
0-331 
+ 
56-387 
56-932 
0-545 
gain 
34 Radiation ... 
0 
56-643 
0-287 
+ 
56-932 
56-929 
0-003 
loss 
35 Friction 
1262-99 
56-790 
0-413 
+ 
56-929 
57*477 
0-548 
gain 
35 Radiation ... 
0 
56-772 
0-687 
+ 
57*477 
57*442 
0*035 
loss 
36 Radiation ... 
0 
55-839 
0-304 
_ 
55-527 
55*543 
0-016 
gain 
36 Friction 
1262-99 
56-114 
0-281 
— 
55-543 
56-124 
0-581 
gain 
37 Radiation ... 
0 
56-257 
0-127 

56-124 
56-137 
0-013 
gain 
37 Friction 
1262-99 
56-399 
0-024 
+ 
56-137 
56-709 
0-572 
gain 
38 Radiation ... 
0 
55-826 
0-065 

55-759 
55-764 
0-005 
gain 
38 Friction 
1262-99 
55-951 
0-093 
+ 
55-764 
56-325 
0*561 
gain 
39 Radiation ... 
0 
56-101 
0-220 
+ 
56-325 
56-317 
0-008 
loss 
39 Friction 
1262-99 
56-182 
0-409 
+ 
56-317 
56-865 
0-548 
gain 
40 Friction 
1262-99 
56-108 
0-100 
+ 
55-929 
56-488 
0*559 
gain 
40 Radiation ... 
0 
56-454 
0-036 
+ 
56-488 
56-492 
0-004 
gain 
Mean Friction... 
1 1260-248 
0-305075 — 
0*575250 
ffain 
Mean Radiation. 
0-3229 
50 — 
0-012973 
gain 
1 
! ^ 
3 
4 
5 
6 
7 
