upon Gun-powder > &c. 
285 
Vent at o. Vent at 1,3. Vent at 2,6. 
22,58 
23,21 
23,00 
22,92 
23,76 
23,26 
22,38 
. 23,06 
23,26 
23>5 6 
3)67,88 
3)7°>°3 
4)93^4 
Means = 22,626 
2 3’3 43 
and 23,285 
If now we take a mean of the 66th and 99th experi- 
ments, and call the recoil, without a bullet, 10,66 as before, 
the velocities will turn out, 
Vent at 0. 
Vent at 1,3. 
Vent at 2,6. 
By the recoil 
1416 
I 5 01 
H94 
And by the pendulum 
they were 1427 
1493 
1494 
The difference is only 
. - 1 1 
+ 8 
+ 34 
The recoil was equally regular in the 117th and five fuc- 
ceeding experiments, when the charge was no lefs than 43 7 1 grs. 
= 1 ounce avoirdupois in powder ; and the velocities of the 
bullets determined from the recoil are very nearly the fame as 
they were (hewn by the pendulum. Thus, in the 1 1 7th, 
11 8th, and 119th experiments the mean recoil was 33,3; 
and in the 120th, 121ft and I 22 d experiments it was 
32,866. And if the recoil without a bullet is called 17,9, as 
it was determined by the 1 23d experiment, which was made 
immediately after the experiments before mentioned, then will 
the velocities be, 
2 By 
Vol. LXXI. 
