Experiment?. 
upon Gun-powder , &c. 
Weight of 
the bullets* 
Grs. 
88th 600 
89th 603 
90th 1184 
92ft 1754 
93d 2^5 2 
Velocity. 
Bv the 
recoil. 
*! 
By the 
pendulum. 
I 24 O 
I 229 
1224 
x 229 
IOI 7 
97 8 
8 93 
9 X 6 
8 x 2 
8 33 
Sums and diff. of the velocities 5186 5185 
Diulrence. 
I I 
5 
+ 39 
~ 2 3 
- 21 
+ 1 
Here the difference in the refult of the two methods does not 
amount to T ^V__th part of the whole velocity ; but I lay no 
ft refs upon this extraordinary argument. 1 am fenfible that it 
muft in iome degree have been accidental but as the difference 
in the velocities, computed fay thefe different methods, was in 
no inftance 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 (hewn by the pendulum, as 
appears by compaiing the curves g- 9 f 9 and m r 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 prafilice. 
Thegreateft difference in the velocities,, as afcertained 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 (hewn by the pendulum are likewife deficient, though 
not in. fo great, a degree. 
'i 
This 
