THE ROYAL ARTILLERY INSTITUTION. 
73 
Table IY. 
ABSTRACT SHEWING- THE VELOCITIES OF DIFFERENT PROJECTILES, 
WITH DIFFERENT CHARGES. 
Nature of gun. 
Calibre. 
Length of 
bore in 
calibres. 
Charge. 
Projectile. 
Initial 
velocity. 
Velocity 
at 
1000yds. 
Nature. 
Mean 
weight. 
Mean 
diameter. 
Smooth-bore. 
lbs. 
spherical 
lbs. 
in. 
ft. 
f 68-pr. 
8*12 
14-0 
16 
solid 
66 
7-91 
1579 
978 
\ 
spherical 
(.150-pr. 
10-48 
11-9 
40 
solid 
150 
10-41 
1726 
1168-3 
Rifled. 
elongated 
fllO-pr. A. ... 
7-00 
14-2 
14 
solid 
111 
7-095 
1211 
1062-0 
\ do . 
7-00 
14-2 
12 
do 
111 
7-095 
1125 
980 
(150-pr. 
7-52 
19-0 
40 
do 
150 
7-50 
1770 
1485 
Table Y. 
TABLE SHEWING- THE “ WORK DONE” AT DIFFERENT DISTANCES, BY 
DIFFERENT GUNS, THE 68-pr BEING TAKEN AS UNITY. 
Nature of gun. 
Charge. 
Weight of 
shot 
solid. 
“Work done” 
at 1000 yds. 
“Work done” at 1000yds. by 150-pr. 
rifled gun in comparison with 68-pr. 
and 150-pr. smooth-bore at 200 yds. 
68-pr. smooth-bore ... 
16 
66 
1-00 
110-pr. Armstrong ... 
12 
111 
1-69 
do do 
14 
111 
1-98 
150-pr. smooth-bore... 
40 
150 
3-24 
150-pr. rifled. 
40 
150 
5-24 
C 68-pr. smooth-bore ... 
16 
66 
1-00 at 200 yds. 
f 150-pr. rifled. 
40 
150 
2-50 at 1000 yds. 
( 150-pr. smooth-bore... 
40 
150 
1-00 at 200 yds. 
1 150-pr. rifled. 
40 
150 
0-88 at 1000 yds. 
Trom this last table will be seen the value of rifled ordnance in com¬ 
parison with smooth-bored at long distances. 
Thus the 150-pr. rifled gun at 1000 yds. would be 2^ times as effective as 
the 68-pr. at 200 yds.; and the 150-pr. rifled at 1000 yds. is nearly as 
efficient as the 150-pr. smooth-bore at 200 yards. At 200 yds., the mean 
penetration of the 68-pr. into the Warrior target was about 2*5 in. At 
1000yds. the 150-pr. rifled gun would be more than double; and as the 
plate is only 4*5 in. thick, the probability is that it would be smashed. 
[vol. III.] 
11 
