upon Gun-powdery Sec. 317 
fuppofe the denfity of the generated fluid is always uniform 
from the bullet to the breech, the velocity of the center of 
gravity of the powder or (which amounts to the fame thing) of 
the elaftic fluid, and the grofs matter generated from it will 
be juft half as great as the velocity of the bullet. If therefore 
we put P to denote the weight of the powder, B the weight 
of the bullet, and v its initial velocity ; then Bu+fP'u — 
■B-f iP*^ will exprefs the momentum of the charge at the 
inftant when the bullet quits the bore. 
If now, inftead of afeertaining the relation of the velocities 
to the weights of the bullets, we add half the weight of the 
powder to the weight of the bullet, and compute the velo- 
cities from the reciprocal fub-triplicate ratio of the quantity 
ITfTP in each experiment, the table will ftand thus : 
93d exp. 
Weight of the 
bullet and half 
the powder. 
B+JP = 
2352+721 
Velocity of the bullet. 
Aftual, Computed. 
812 812 
;:.'d ; 
Error of the 
theory. 
■ dk 
; <wmmammmes 
91ft 
1 754 + 7 2 * 
8 93 
892 
90 th 
1184 + 72! 
IOI7 
ion 
1- 6 
89th 
603 + 72 \ 
I224 
1243 
.+ 19 
88th 
600 + 72! 
1240 
1245 
+ J 
87 th 
354 + 7 2 i 
1288 
1449 
+ 16 1 
86th 
251+72! 
14 3° 
* 5 % 
‘+159 
85 th 
90 + 72! 
2109 
'999 
^IIO 
Vol. LXX1. 
U n 
Th< 
