IY2 OF PROJECTILES.
to the depth of 6 feet. If a i 61 b. shot with the mediumcharge, fired at the distance of 340 yards, penetrate 10 feet,a 4.16. shot with the medium charge, at the distance of 680yards, will penetrate only to the depth of gi. feet.
The relative penetrations of shot, projected from differentdistances, with given initial velocities.
Relative Penetrations.
fe
O
V)
1 _ -
1
3
O
C /3
•2
0
CL,
t-u.
u
O
Close
W.
O
0
V.
< 3 J
to
At'
At
At
u
A
0
the
340
680
1000
3
,tp
S
-H
'M
Butt.
yards.
yards.
yards.
%
, £
5
>
c
iCfSt cz.
Inches ,
Feet,
32
lZ r
5.-60
12
15*7
33210
26355
20726
16015
16
6. 9
4.566
9-5
1618
29952
22877
17082
12452
8
4 14*
3-653
7-6
1696
26000
18696
13069
8837
4
2. 7 f
2.881
6
1720
21328
14122
8902
5290
32
9. iZi
—
—
* 35 °
26240
20262
15356
11430
16
4 14?
—
—
1416
22932
16754
”935
8255
8
3 - 4 \
—
1450
19229
13106
8566
53 ”
4
1 io£
—
1467
15516
I9563
5458
2867
184. To judge of the total effects of shot, it should beobserved ; that the larger the shot are, the sooner the upperparts are deprived of their base, and fall down. If D a*expressing the penetration of shot, be multiplied by D* aquantity proportional to the base of the cylindrical cavity,made by the shot, D 3 U* will be expressed by the size ofthe hole; that is to fay, the holes made by the shot arein the compound ratio of the weight of the shot, and thesquare of its velocity. The effects of a 641b. shot imping-ing on a parapet of earth, with a velocity of 1247 feet, areto the effects of a 321b. shot, with an initial velocity of 1350feet, as 64 x 1247 1 : 32 X 1350 1 or as 43 : 25 nearly.
Hence it appears, that 64 prs. are in both cafes (181)more proper for battering in breach than 32 prs. and thesole reason why they are not used in the attack of places, isthe difficulty of transporting and working them.
*85. Since