5]R. JOULE ON THE MECHANICAL EQUIVALENT OF HEAT. 
67 
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. 
5 Friction 
5 Radiation ... 
1251*81 
0 
60*940 
61*035 
6*431 — 
0*237 — 
60*222 
60*797 
60*797 
60*799 
O 
0*575 gain 
0*002 gain 
6 Radiation ... 
6 Friction 
0 
1254*71 
59*675 
59*919 
0*125 -f 
0*157 + 
59*805 
59*795 
59*795 
60*357 
0*010 loss 
0*562 gain 
7 Radiation ... 
7 Friction 
0 
1254*02 
59*888 
60*0/6 
0*209— 
0*111 — 
59*677 
59*681 
59*681 
60*249 
0*004 gain 
0*568 gain 
8 Radiation ... 
8 Friction 
0 
1251*22 
58*240 
58*237 
0*609 + 
0*842 + 
58*871 
58*828 
58*828 
59*330 
0*043 loss 
0*502 gain 
9 Friction 
9 Radiation ... 
1253*92 
0 
55*328 
55*528 
0*070 + 
0*148 + 
55*118 
55*678 
55*678 
55*674 
0*560 gain 
0*004 loss 
10 Radiation ... 
10 Friction 
0 
1257*96 
54*941 
54*985 
0*324 — 
0*085 — 
54*614 
54*620 
54*620 
55*180 
0*006 gain 
0*560 gain 
11 Radiation ... 
1 1 Friction 
0 
1258*59 
55*111 
55*229 
0*069 + 
0*227 + 
55*180 
55*180 
55*180 
55*733 
0*000 
0*553 gain 
12 Friction 
12 Radiation ... 
1258*71 
0 
55*433 
55*687 
0*238 + 
0*265 + 
55*388 
55*954 
55*954 
55*950 
0*566 gain 
0*004 loss 
13 Friction 
13 Radiation ... 
1257*91 
0 
55*677 
55*674 
0*542 + 
0*800 + 
55*950 
56*488 
56*488 
56*461 
0*538 gain 
0*027 loss 
14 Radiation ... 
14 Friction 
0 
1259*69 
55*579 
55*864 
0*583 — 
0*568 — 
54*987 
55*006 
55*006 
55*587 
0*019 gain 
0*581 gain 
15 Radiation ... 
15 Friction 
0 
1259*89 
56*047 
56*182 
0*448 — 
0*279- 
55*587 
55*612 
55*612 
56*195 
0*025 gain 
0*583 gain 
16 Friction 
l6 Radiation ... 
1259*64 
0 
55*368 
55*483 
0*099 + 
0*250 + 
55*195 
55*739 
55*739 
55*728 
0*544 gain 
0*011 loss 
17 Friction 
17 Radiation ... 
1259*64 
0 
55*498 
55*541 
0*499 + 
0*709 + 
55*728 
56*266 
56*266 
56*235 
0*538 gain 
0*031 loss 
18 Radiation ... 
18 Friction 
0 
1260*17 
56*769 
56*966 
1*512- 
1*372- 
55*230 
55*284 
55*284 
55*905 
0*054 gain 
0*621 gain 
19 Radiation ... 
19 Friction 
0 
1262*24 
60*058 
60*112 
1*763— 
1*450 — 
58*257 
58*334 
58*334 
58*990 
0*077 gain 
0*656 gain 
20 Radiation ... 
20 Friction 
0 
1261*94 
60*567 
60*611 
1*542 — 
1*239 — 
58*990 
59*060 
59*060 
59*685 
0*070 gain 
0*625 gain 
21 Friction 
21 Radiation ... 
1264*07 
0 
58*654 
58*627 
0*321 — 
0*018- 
58*050 
58*616 
58*616 
58*603 
0*566 gain 
0*013 loss 
22 Friction 
22 Radiation ... 
1262*97 
0 
58*631 
58*624 
0*243 + 
0*505 + 
58*603 
59*145 
59*145 
59*114 
0*542 gain 
0*031 loss 
23 Friction 
23 Radiation ... 
1264*72 
0 
59*689 
59*943 
1*100- 
1*027 — 
58*284 
58*894 
58*894 
58*938 
0*610 gain 
0*044 gain 
1 
2 
3 
4 
5 
6 
7 
K 2 
