2 95 
upon Gun-powder, &c. 
Vent at o. Vent at 1,3. 
/■40th exp. was 18, and in the 43d exp. it was 18,3 
The re-] ' 1 7 * 7 r ’ 44th - 18,35 
coilin the I 42d - 17,91 ~ 45th - *8,35 
[47th - 8,1 - 46th - 18,35 
4 ) 7 ^ 7 2 4)73,35 
Means— 17,93 and 18,34 
And in the yed and 73d experiments the recoil, with the 
fame charge without a bullet, was 8,72, and 8,47 — 8, 595 at 
a medium, the velocities therefore turn out, 
Vent at o. Vent at 1,3. 
By the recoil 1105 - 1153 
inftead of 122 5 and 1276 as they were fhewn by the pend. 
The difference 120 and 123 feet in a fec.oud amounts to near 
one twelfth part of the whole velocity. 
This difference is undoubtedly owing to the recoil without a 
bullet being taken too great ; for it is not only greater than it 
ought to be, in order that the velocities of the bullets may 
come out right ; but it is confiderably greater in proportion 
than the recoil with any other charge. 
Q n • p' 7 0 • - ' h' \-r : WT' \l JO \ v 
Thus, with 145 grains of powder the recoil was 4,4 
with 165 grains - it was 5,55 
290 grains - - - 10,66 
33 ° grains - - - 12,7 
and with 437} grains - - - it wa,s 17,9 
And if the recoil with 218 grains is determined from thefe 
numbers by interpolation, it comes out 7,5 ; and with that 
R r 2 value 
