384
NEW EXPERIMENTS IN GUNNERY.
TRACT 34.
The Pendulum was the same as it hung since yesterdaywith all the balls in it; but the other end of it was turned,which bore the firings very well, the core being of sound drywood. At the end of the experiments this day the pendulumweighed 689 lb, which is only lib lass than it ought tobe by the addition of the balls and plugs to the first weight;so little was its loss of weight by evaporation, owing to thedryness of the wood.
The diameter of the balls 1'96 inches.
The plugs weighed 6-t oz to 8 inches.
The value of i, or mean point struck, 89 - l inches.
The first penetration, being in sound wood, tvas 14^inches to the fore part of the ball.
This set of experiments, as well as those of the three pre-ceding days, were made to determine the best charge, orthat which gives the greatest Telocity.
This is a good set of experiments.
Mean recoil, and velocity of the ball by the pendulum,are as follow,
Powder
Recoil
Veloc.
6
- -
21-7 -
- 1331
8
- -
25-6 -
- 1386
10
- -
2 T9 -
- 1402
12
- -
31-0 -
- 1453
14
-
82-5 -
- 1402
which velocities,
as well
as the recoils, are found by adding
those of each sort together, and dividing by the numberof them, as below :
6
8
10
12
14
1320
1351
1382
1472
1403
1349
1360
1403
139S
1405
1323
1447
1420
1490
1399
3 )3992
4158
4206
4360
4207
means 1331
1386
1402
1453
1402
where the velocity with
12 oz is greatest.
END OF VOL. II.
T. DAVISON, Lombard-street,
Whitefriars, London.