289 
upon Gun-powder , See. 
Velocity. 
Experiments. 
Weight of 
the bullets. 
By the 
recoil. 
By the 
pendulum. 
Difference. 
88 th 
Grs. 
600 
I 240 
1229 
-f I I 
Bpth 
6° 3 
1224 
I 229 
“ 5 
90 th 
I I 84 
IOI7 
978 
+39 
9lft 
054 
8 93 
9 1 6 
~ 2 3 
92 d 
2352 
8 1 2 
8 33 
- 21 
urns and diff. of the velocities 
5186 
5 i8 5 
+ 1 
Here the difference in the refult of the two methods does not . 
amount to T ^_th part of the whole velocity; but I lay no 
flrefs upon this extraordinary argument. 1 am fenfible that it 
mu ft in fome degree have been accidental ; but as the difference 
in the velocities, computed by thefe different methods, was in 
no inifance confiderable, not being in any cafe fo great as what 
frequently occurred in the moll careful repetition of the fame 
experiment, and as the velocities, as determined by the recoil, 
were much more regular than thofe fhewn by the pendulum, as 
appears by comparing the curves g, f, and rn 9 n , (fig. 16.) 
with the crooked line c, d , I think we may fairly conclude, 
that this new method may with fafety be relied on in pradlice. 
Thegreateif difference in the velocities, as afeertained by the 
two methods, appears, in the inftance of the 85th experiment, 
where the velocity determined from the recoil exceeds that 
fhewn by the pendulum by 346 feet in a fecond, the former ve- 
locity being that of 2109 feet in a fecond, the latter only 1763 
feet in a fecond ; and in the two fucceeding experiments, the 
velocities fhewn by the pendulum are likewife deficient, though 
not in fo great a degree. 
This 
