Upon Gun-powder, -See. 
3°9 
Weight 
of the 
bullet. 
Velocity of the bullet 
* * 
Actual. Computed. 
Difference. 
Colle#ive 
preffure. 
p2d exp. 
2352 grs. 
812 
812 
I ,DOOO 
9 i ft 
1754 
8 93 
940 
- 47 
6*9020 
90th 
00 
IGI7 
1145 
*- 128 
0,7897 
89 th 
603 
1224 
1 604 
- 380 
CO 
Q 
88 th 
600 
1240 
1608 
- 368 
°>5949 
87 th 
35 4 
1288 
2093 
- 805 
04778 
86th 
251 
143® 
2486 
- 1036 
0,3310 
85th 
90 
2 109 
4 r 5 r 
- 2042 
0,258! 
In the following figure let AB reprefent the axis of the piece, 
and AP the length of the fpace filled with powder ; and at the 
point P let the perpendicular PH be erefted, upon which let PL. 
and PM be taken from P towards H of fuch magnitudes that 
while PL expounds the uniform force of gravity, or the weight 
of the bullet, PM (hall be as the force exerted by the powder 
Vol, LXXI. T t upon 
