o 0 g Mr. Thompson’s Experiments 
N. B. The charge of powder was the fame in each experi- 
ment, and confifted of 145 grains in weight. 
Weight 
of the 
bullet* 
Velocity of the bullet* 
r — *- A - — * 
Actual. Computed* 
Difference. 
85 th exp. 
90 grs. 
2IO9 
2 1 09 
— — 
86th 
25 1 
143° 
1 262 
•4- 1 6 & 
:87 th 
354 
1288 
0 ' 
+ 225 
83 th 
600 
1240 
GC 
q-423 
89 th 
603 
1224 
815 
+ 409 
90 th 
1184 
1017 
5 Sl 
+ 436 
9 1 ft 
1754 
893 
478 
+ 4 i 5 
9id 
2352 
812 
413 
+399 
The computed velocities, as they are fet down in this table, 
were determined from the adual velocity of the bullet, as deter* 
mined by the recoil in the 85th experiment ; and the reciprocal 
fub-duplicate ratio of its weight to the weight of the bullet in 
each fubfequemt experiment ; and in the laid column is marked > 
the difference between the experiment and the theory, or the 
number of feet in a fecond, by which the adual velocity 
exceeds the computed* 
But in order that we may fee this matter in different points 
of view, let the order of the experiments be now' inverted, and 
let the computed velocities be determined from the adual velo- 
city in the 93d experiment ; and affuming the total or collec- 
tive preffure exerted by the powder upon the bullet in that expe- 
riment equal to unity, let the coliedive preffure in the other 
experiments be computed from the ratio of the adual to the 
computed velocities, and the table will ftand thus * 
