THE ROYAL ARTILLERY INSTITUTION. 
51 
4iin. of armour and 18 in. of teak in the “ Warrior/' and this difference 
accounts as nearly as possible for this structure weighing about 20 lbs. per 
foot superficial heavier than the “ Warrior.” 
The object aimed at by the inventor was to give a better support to the 
outside armour than is afforded by timber only, and at the same time to 
avoid rigidity of structure which he considers so destructive to both armour 
plates and fastenings. 
The target for this experiment presented a front measuring 18 ft. 4 in. by 
10 ft. high; and to give it support equivalent to what it would receive from 
adjacent parts, if forming part of a large structure, it was surrounded on all 
sides by a casing of boiler plate, which, if included in the weight of the 
target, would add about 48 lbs. per foot superficial to the weight already 
given. 
It is not necessary here to describe minutely the practice at this target. 
It will be sufficient to say that it was carried on by 68-pr. service guns and 
110-pr. Armstrongs, at 200 yards, firing first with shells filled with sand, 
then with live shells, then with solid cast-iron shot, then with 200-lb. bolts 
from 110-prs., first singly and afterwards in a salvo of three, in one instance 
a salvo of five guns being fired against it; the object of the experiment 
being to give this target a battering as nearly as possible equal to that 
received by the original “ Warrior” on its first trial. 
After this the Armstrong 12-ton gun fired two spherical cast-iron shot 
and one cylindrical steel shot; but this last shot bore no part in the 
comparison with the “W'arrior,” as that target was never struck by a steel 
300-lb. shot. 
The shells filled with sand did of course little or no damage beyond the 
usual marks on the armour: in the case of the 110-pr. about ^-in. deep, 
and of the 68-pr. about l^-in. deep. 
The live shells did much the same. 
The 68-pr. cast-iron shot indented the armour about one-third more than 
the “ Warrior,” the depth of the impression itself being about 2| in., and of 
the more extended bulge about 1 in. more. 
The 110-pr. cast-iron shot also indented altogether from 2J to 3|in., 
including some local bulging, the depth of the impressions themselves being 
from 1J in. to If in. deep, or about twice as much as in the "Warrior.” 
A few rivet heads were broken off by these shot and the plates were 
cracked slightly, especially the lower one, which was of inferior manufacture, 
but no bolt was broken, and the plates were only slightly displaced. 
The salvo from the three 110-prs., throwing 200-lb. cast-iron shot, did 
little damage. 
That from the two 68-prs. and three 110-prs. did somewhat more injury, 
but still the target stood remarkably well; the first through-bolt broken 
occurred in this salvo. At the rear some of the ribs were slightly buckled 
and slight curvatures appeared, but nothing whatever of any consequence. 
After this the 300-lb. steel, cylindrical, round-headed Armstrong shot, 
fired with 45 lbs. of powder, struck at the junction of two plates, and 
completely penetrated the target, making a hole in the armour of about 
1 ft. 2 in. by 1 ft. 1 in. The hole in the skin measured about 2 ft. by 1 ft. 
6 in.; one rib was smashed and a quantity of fragments were carried through 
to the rear. 
