upon Gun-powder , &c. 
Vent at 0, 
Vent at 1,3. 
Vent at 2,6. 
22,58 
23,21. 
23,06 
22,92 
23,76 
23,26 
CO 
co 
s\ 
ct 
23,06 
23,26 
2 3 ? 5 6 
3)67,88 
0 
Vi 
O 
Co 
4 -) 93 ’ i 4 - 
Means = 22,626 
2 3>3 43 
and 23,285 
If now we take a mean of the 6oth 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 
1501 
1494 
And by the pendulum 
they were 1427 
T 4 93 
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 fhewn by the pendulum. Thus, in the 1 1 7th, 
1 1 8th, and 119th experiments the mean recoil was 33,3; 
and in the 120th, 121ft and I22d experiments it was 
32,866. And if the recoil without a bullet is called 17,9, as 
it was determined by the 123d experiment, which was made 
immediately after the experiments before mentioned, then will 
the velocities be. 
2 cr_ 
Vol. LXXI. 
By 
