ON THE LIECHANICAL EQUIVALENT OF HEAT. 
401 
The quantitle.s given in the annexed table are sums obtained by adding together 
the corresponding quantities in Series I. of Tables B and C. 
In trials 1, 6, and 9 the loss by conduction has been assumed the same as in 
trial 10 ; while in trials 2, 7, and 8 this loss has been given the same value as calcu¬ 
lated for trial No. 11. 
Series I. — Unjacketed Trials. 
"Work done. 
Heat. 
Terminals. 
Conduction. 
Diff. of tempera¬ 
ture between 
brake and air. 
Heavy trials . 
Light trials 
: 
642,876,020 
272,418,189 
677,309 
3.30,280 
+ 19 
- 131 
+ 116 556-4 
— 496 558-4 
We have, therefore, the same value of K given by 
.542,876,020 
677,444 + 556-4 R 
272,418,180 
329,653 + 558-4 R ’ 
and, solving for R., we get 
R = 36-86, 
or, using this value of R and solving for K, 
K = 777-81, 
which is the mean value deduced from this series of eight unjacketed trials. 
Radiation Coefficient for Jaclzeted Trials, Nos. 12 to 42. 
46. As in Series L, we get the sums of work, heat, &c., shown in the annexed 
table :— 
Work done. 
Heat. 
Terminals. 
Conduction. 
Diif. of tempera¬ 
ture between 
brake and air. 
Heavy trials . 
Light trials 
1,752,718,746 
874,319,846 
2,236,681 
1,108,013 
- 64 
- 183 
- 886 
- 1369 
186-2-6 
1872-5 
In this table the sums are given of the respective quantities in the trials used in 
Determinations Vi. to XVIII. inclusive, Series No. V. being included, because no 
error was apparent in the quantities obtained; Series No. IV. being omitted, since 
the moment given could not be guaranteed correct with any certainty. 
VOL. cxr.—A. 3 F 
