oi6 Mr. Thompson’s Experiment j 
remain after the explofion of gun-powder are carried forward 
with the generated elaftic fluid, and being carried forward 
retard its motion. — But to return from this digreflion. 
As it appears from, thefe experiments, that the relation of the 
velocities of bullets to their weights is different from that which 
Mr. robins’ s theory fuppofes, it remains to inquire what the 
law is which a&ually obtains. And, firft, as the velocities 
bear a greater proportion to each other than the reciprocal fub- 
duplicate ratio of the weights of the bullets, let us fee how 
near they come to the reciprocal Tub-triplicate ratio of their 
weights. 
Velocity of the bullet 
Weight 
O 
r "" 
Computed. 
Actual. 
Computed. 
or the 
bullet. 
Recip. Tub- 
Error of 
Error of 
Recip. lub- 
dup. ratio. 
the theory. 
■the theory. 
trip, ratio. 
92d 
2352 
812 
812 
‘ d 
812 
gift- 
1754 
940 
+ 47 
893 
+ 2 
395 
90th 
1184 
1145 
+ 12-8 
1017 
+ 4 
1021 
89 th 
603 
1604 
4 380 
1224 
+ 54 
1278 
88th 
600 
1608 
4 - 368 
1240 
+ 4 ° 
1280 
87 th 
354 
2093 
4 805 
1288 
+ 239 
1527 
86th 
251 
2486 
4 1056 
1430 
4 282 
1712 
85 th 
90 
4 * 5 * 
4 2042 
2109 
+ 3 01 
2410 
Here the velocities computed upon the lafl: fuppofition appear 
to agree much better with the experiments than thoie com- 
puted upon Mr. robins’ s principles; but ftill there is a confi- 
derable difference between the actual and the computed veloci- 
ties in the three lafl experiments in the table. 
As the powder itfelf is heavy, it may be confidered as a 
weight that is put in motion along with the bullet ; and if we 
