upon Gun-powder , See, 2 yt 
The fourth column (hews the difference of the computed and 
a&ual velocities, or the number of feet in a fecond by which 
the affual velocity exceeds or falls fhort of the computed : and 
in the fifth column is fet down the number of experiments 
with each charge, from the mean of which the actual velo- 
city was determined. 
The agreement of the computed and adtual velocities will 
appear more linking, if we take the film and difference of tilde 
velocities with all the charges except the firff : thus. 
Sum of the velocities, — 1 7 64. 
/— » — — 1 — — - -i 
Computed. Actual. Difference.- N° of exp. 
9864 9854 -10 23 
\ ' 
So that it appears, that the difference, or the affinal velo- 
city, was fmaller than the computed by part only at a 
mean of 23 experiments. 
But as by far the greater number of the experiments were 
made with the following charges, 290, 218, 208, 165, 
and 145 grains of powder, let us take the fum and difference 
of the computed and aflual velocities of thofe charges : thus, 
Difference. N° of exp. 
+ 59 18 
Here the agreement of the theory with the experiments is fa 
very remarkable, that we muff flippofe it was in fome meafure 
-accidental ; for the difference of the velocities in repeating the 
•fame experiment is in general much greater than the difference 
of the computed and actual velocities in this inftance ; but, I 
think, we may fairly conclude, from the refult of all thefe 
- 2 O 2 trials-. 
Sum of the velocities 
r -r A — \ 
Computed. Actual. 
5985 6044 
