DR. J. P. JOULE OX A NEW DETERMINATION 
380 
Table III., Part 2. — Experiments with almost solely Friction of Water. Weight, W, 
lifted, 16477 '4 grains. Average proportion of metallic to total friction, Time 
occupied by each experiment, 41 m . V — 0°‘077214 ; P = 2'77386. 
No. 
Number of 
revolutions. 
11 + r. 
Capacity 
of the 
calorimeter. 
n 
Mean 
temperature 
of the 
caloi imeter. 
Mean 
temperature 
of 
Difference. 
Rise of 
temperature 
of the 
calorimeter. 
Ditto, 
corrected 
for 
radiation, &c. 
Mechanical 
equivalent, 
or 
R W P 
JA 
C T 
V 
1 
4904-95 
84160 
7 
412-530 
422 
744 
10-214 + 
45 
509 
44 
295 
775 
78 
2 
4940 58 
84124 
2 
390-866 
381 
225 
9 641 - 
43 
909 
44 
740 
774 
04 
3 
4925 -28 
84118 
1 
367 "65 
364 
•627 
3-138- 
44 
564 
44 
767 
771 
14 
4 
4922 -92 
84071 
2 
365-695 
369 
•159 
3 464 + 
45 
125 
44 
857 
769 
56 
5 
4938 0 
84012 
2 
382 816 
380 
•063 
2-753- 
44 
747 
44 
986 
770 
39 
6 
4936 -3 
83930 
2 
384 -452 
391 
•613 
7 161 + 
45 
580 
44 
859 
772 
82 
7 
4958 0 
83940 
7 
382-015 
386 
005 
3 990 + 
45 
530 
45 
121 
771 
82 
8 
4925 -3 
83882 
2 
403 -368 
390 
■360 
13 -008- 
43 
643 
44 
741 
773 
64 
9 
4925 -9 
83907 
2 
367897 
364 
■284 
3-613- 
44 
564 
44 
852 
771 
68 
10 
4927 6 
83884 
2 
372 -565 
370 
•435 
2 -130- 
44 
706 
44 
857 
772 
09 
11 
4934 3 
8391 1 
2 
375 915 
381 
•468 
5 -553 + 
45 
438 
44 
810 
773 
81 
12 
4935 0 
83889 
2 
372 -2S5 
386 
-270 
13 985 + 
46 
150 
44 
795 
774 
38 
13 
4929-0 
83880 
2 
373 936 
375 
•248 
1 -312 + 
44 
930 
44 
765 
774 
22 
14 
4923 -22 
83988 
7 
373 -092 
380 
089 
7 597 + 
45 
487 
44 
688 
774 
61 
15 
4923 0 
83872 
7 
383 -670 
395 
•008 
11 338 + 
45 
850 
44 
629 
775 
60 
16 
4923 0 
83897 
2 
372 -033 
382 
•095 
10-062 + 
45 
707 
44 
776 
773 
00 
17 
4928 0 
83889 
7 
392 -412 
390 
■767 
1 645- 
44 
652 
44 
788 
773 
47 
18 
1926 -0 
83904 
7 
400-189 
402 
•495 
2 306 + 
45 
105 
44 
800 
772 
69 
19 
4925 -75 
83891 
2 
421 -652 
413 
•149 
8 -503- 
44 
148 
44 
867 
771 
68 
20 
4926 -33 
83944 
2 
394 -f 41 
406 
•037 
11 -496 + 
45 
763 
44 
559 
776 
68 
21 
4924-0 
83938 
7 
413 330 
419 
•217 
5 887 + 
45 
459 
44 
774 
772 
76 
Average 
■{ 
385 -86 
or 59° -98 
•• 
•• 
773 
•136 
An error of four or five seconds in the time at which the wheel was started and 
stopped will account for the divergence of the revolutions in Nos. 1 and 7 from the 
average. For the rest, it will he seen with what great constancy the resistance of the 
paddle was kept up. 
The weights were also so steady that the total distance run by them in their risings 
and fallings only amounted to about 30 feet in each experiment. This, taken with 
the friction of the pulleys = 30 grains, gives a quantity to be subtracted from the 
equivalent too small to require estimation. 
