TRACT 37 .
OF GUNNERY.
213
gun; after which, they constantly decreased again, till thebore was quite filled with the charge. Tl»e quantities ofpowder, when the velocities arrived at their maximum orgreatest state, were various, as might be expected, accord-ing to the lengths of the guns: the weight of powder, withthe length it extended in the bore, and the fractional part ofthe bore it occupied, are shown in the following table, of thecharges for the greatest effect.
The Charg
Gun,
Length
Weight,
Len
gth.
of the
n°
bore.
02
Inches
Part of
whole
1
28-5
12
8-2
3
T&
2
38-4
14
9-5
3
Ta
3
57-7
16
10*7
3
T"5"
4
80-2
18
12-1
_3
8. Some few experiments in this course were made toobtain the ranges and times of flight, the mediums of whichare exhibited in the following table.
Guns.
Pow-
Bail’s
Eleva.
Time of
Range
First
der
\vt
diam
gun.
flight.
veloc.
n° 2
07.
2
oz
16
dr
10
inches
1-96
45°
sec
21-2
feet
5109
feet
863
do.
2
16
5
1-96
15
9’2
4130
868
do.
4
16
8
1-96
15
9-2
4660
1234
do.
8
16
12
1-96
15
14’4
6066
1644
do.
12
16
12
1-95
15
15-5
6700
1676
n° 3
8
15
8
1-96
15
10-1
5610
1938
In this table are contained the following concomitant data,determined with a tolerable degree of precision; viz, theweight of the powder, the weight and diameter of the ball,the initial or projectile velocity, the angle of elevation of thegun, the time in seconds of the ball’s flight through the air,and its range, or the distance where it fell on the horizontal