upon Gun-powder, he. 2-74 
the difference, equal five feet in a fecond, is lefs than what 
occurred in a repetition of the fame experiment. 
With 218 grains of powder, and the vent at o, the velocity 
at a mean in the 40th, 4 iff, qad, and "47th experiments, 
was at the rate of 1225 feet in a fecond; and with the fame 
charge, and the vent at 1,3, the velocity was 1276 feet in a. 
fecond at a mean of four experiments, viz., the 43d, 44th,. 
45th, and 46th. 
In the fir ft fet of experiments, with 290 grains of powder*, 
the velocities were,. 
. • . f „ • • 
Vent at o. Vent at 1,3, Vent at 2,6. 
1414 1476 1502 
1455. r 5 2 ° X 45 Q 
1412- 1483 1433 
J 454 
t- ' 1 •* " ' ■■■■ — ■« ' r ».i I nrw - - "■ .1. » H, 
3)4281 3)4479 4)5839 
Means 1427 14 93 1460 
See the experiments from N° 48. to N° 57. mclufive.,. 
In the fecond fet the velocities were, 
Vent at 0. 
Vent at 2,6. 
1419 
1438 
1460- 
1423 
1462 
0 7 s 
1436 
4)5777 
3)4239 
Means 1 444 
I 4 I 3 
See the experiments from N° 
109, to N° 11 5. inclufive, 
