389 
DR. J. P. JOULE ON A NEW DETERMINATION 
Table V., Part 1. — Experiments to ascertain the Effect of Radiation, &c. Time 
occupied by each experiment, 41™. Weight raised for an instant, 2 1729 '56 grains. 
No. 
Revo- 
lutions. 
r. 
Mean 
temperature 
of calori- 
meter. 
Mean 
temperature 
ot air. 
Difference. 
Rise of 
temperature 
of calori- 
meter. 
Correction 
to an- 
te mperatu re. 
Thermal effect 
of unit 
difference of 
temperature. 
la 
lb 
22-0 
20-64 
386-760 
454-455 
419-637 
427 134 
32-877 + 
27-321- 
3-52 + 
2-37- 
J 3-099 + 
0-09784 
2a 
2b 
2116 
22-0 
390-200 
460-345 
433-283 
444-140 
43 083 + 
16-205- 
4-40 + 
1-33- 
| 2-444 + 
0-09665 
3a 
3b 
20-0 
21-22 
380-885 
448-250 
410-976 
418-488 
30-091 + 
29-762- 
2-77 + 
2-50- 
j 1-369 + 
0-08805 
4a 
4 b 
22-0 
2316 
386-310 
455-170 
420-428 
436-858 
34-118 + 
18-312- 
3-62 + 
1-64- 
| 1-965 + 
0-10032 
5a 
5b 
21- 42 
22- 0 
397-770 
465-440 
428-568 
441-275 
30-798 + 
24-165- 
3-46 + 
2-12- 
j 3-283 + 
0-10152 
6a 
6b 
19-0 
22-0 
396-300 
465-630 
438-413 
447-180 
42T13 + 
18-450- 
3-84 + 
1-42- 
j 2100 + 
0-08685 
7 a 
7b 
21 0 
22-0 
377-300 
444-240 
405-069 
414354 
27-769 + 
29886- 
2-60 + 
2-52- 
] 1-509 + 
0-08880 
Table V,, Part 2. — Experiments with almost solely Friction of Water. Weight, W, 
lifted, 21729*56 grains. Average proportion of metallic to total friction, yy-g-. 
Time occupied by each experiment, 41 ,n . V=0°*077214 ; P = 2*77386. 
No. 
Number of 
revolutions. 
E + r. 
Capacity 
of the 
calorimeter. 
C. 
Mean 
temperature 
of the 
calorimeter. 
Mean 
temperature 
of 
the air. 
Difference. 
Rise of 
temperature 
of the 
calorimeter. 
Ditto, 
corrected 
for 
radiation, &c. 
T. 
Mechanical 
equivalent, 
or 
R W P 
C T V 
l 
5653 -0 
83924 2 
425 -354 
419-585 
5 -769 — 
67 -336 
67-597 
774 93 
2 
5653-16 
83960 -2 
430 165 
436 -986 
6 821 + 
68 582 
67-687 
773-54 
3 
5652 -55 
83970-5 
419 268 
413-363 
5 -905- 
67 -214 
67 -613 
774 -35 
4 
5648 66 
84001 -7 
425 -460 
426 763 
1 -303 + 
67-877 
67-549 
774 00 
5 
5645 -4 
83980 2 
436 432 
433 -830 
2 -602- 
67 -522 
67 -453 
774-90 
6 
5646 -5 
83973 7 
435 661 
439 -140 
3 -479 + 
68 215 
6/ -730 
772-17 
7 
5659-0 
83970 -7 
415 -580 
408-720 
6-860- 
67 232 
67-707 
774 -03 
Average 
426 -846 
or 63°-14 
} - 
•• 
•• 
773-99 
The average number of revolutions per minute in the last two tables were 101*4 and 
171*5. The fluid resistances, 7630*2 and 21548*5, were therefore almost exactly 
proportional to the squares of the velocities. 
