2 j 6 Mr. Thompson Experiments 
And talking the means of all the velocities in both fets ia 
each poiition of the vent it will be, 
Vent at o. Vent at 1,3. Vent at 2,6. 
Mean velocity 1436 1493 - 1 4 3.7 
The mean recoils in thefe ; experiments were, 
Vent at o. Vent at 1,3. Vent at 2,6. 
22, SB 23,34 '23,61 
In the experiments with 310 grains of powder the velocities 
of the bullets were not determined with fufficient accuracy to 
be depended on ; but the recoils, which were meafured with 
great nicety, were as follows, viz. 
Vent at o. Vent at 1,3. Vent at 2,6 
24,69 24,95 24,9 
With 330 grains of powder the mean velocities and recoils 
•were, 
1 
Vent at o. Vent at 1,3. Vent at 2,6. 
Velocities 1594 162 5 1 525 
Recoils 26,075 26,4 25,3 
In the experiments with 437 1 grains (an ounce avoirdupois) 
of powder the velocities and recoils were, 
Vent at o. Vent at 2,6. 
1 — 
Velocity. 
1 
Recoil. 
t " 
Velocity. 
— 
Recoil. 
3738 
3 3» 
1 7° 7 
3 2 ’5 
1824 
33m 
1757 
33’ 2 
CO 
0 
M : 
n ■: 
- 
33> 6 
I789 
3 2 >9 
3) 5 2 9 1 
3)99.9 
3)5 2 53 
3)98,6 
Means 1764 
33 ’3 
1 75 1 
32,866 
Secondly, 
