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 Velocity of the bullet, 
of the / A — 
bullet. 
. Actual. 
Computed. 
Difference. 
85 th exp. 
pogrs. 
2IO9 
2169 
:86 th 
25 1 
I43O 
1262 
+ 1 68 
8 /th 
354 
1288 
1063 
+ 225 
88th 
600 
1240 
817 
+ 425 
89 th 
603 
1224 
S15 
' + 4°9 
path 
1184 
.1617 
5^ 
+ 436 
91ft 
r 754 
893 
478 
+ 415 
pid 
2 35 2 
812 
413 
+ 399 
The computed velocities, as they are let down in this table, 
were determined from the a&ual 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 fubfequent experiment s and inthe laft column is marked 
the difference between the experiment and the theory, or the 
number of feet in a fccond, by which the a&ual velocity 
exceeds the computed. 
■But in order that we may fee this matter in different points 
of view, 4et the order of the experiments be now inverted, and 
let the computed velocities be determined from the adual velo- 
city in the 9 2d experiment s and affuming the total or collec- 
tive preflure exerted by the powder upon the bullet in that expe- 
riment equal to unity, let the collective prefliire in the other 
experiments be computed from the ratio of the a&ual to the 
computed velocities, and the table will ftand thus ; 
9 2d 
