THE ROYAL ARTILLERY INSTITUTION. 
73 
7 //, 0 steel shot with velocity due to 
yds. 
600 
1 
foot tons. 
1497 
8"-0 
a 
1000 
1 
1736 
9"*22 
„ 
1000 
1 
2666 
9"-2 2 
a 
600 
2 
5938 
9 /7, 22 cast-iron shot 
„ 
1000 
1 
2666 
9"'22 steel shell 
a 
600 
1 
2969 
10"'0 steel shot 
n 
600 
4* 
12,584 
10"*0 
„ 
1000 
2 
4257 
* 13 ) 34,313 
Average blow .2639 foot tons. 
With the exception of a small piece which has been cnt out of the lower 
sill, and the loss of about 3 square feet of the exterior plate which is broken 
off the right top corner and leaves the edges of the vertical plates exposed, 
this shield, although presenting a very battered appearance, is substantially 
entire. 
It is, however, cracked through and through. Out of 37 armour bolts 
with their nuts and washers for securing the shield to the girder frame ll are 
gone, as are the greater parts of the rivets of the frame itself; these would 
have formed splinters of a dangerous character; one bolt weighing 25 lbs. 
was thrown 28 feet to the rear. The shield is still in a condition to shelter 
a gun detachment, and would apparently stand several more blows. 
The mode by which the girder supporting the shield is attached to the 
granite floor, namely by 10 bolts passing through a sole plate, has proved 
sufficient for the purpose. 
It has budged very little, but sufficiently so to have disturbed the pivot of 
the gun behind it, which became unserviceable after seven blows on the shield. 
The inner skin is rent in several places, but no portion of it has come away. 
6. The rolled 13-inch iron plate in the west embrasure was struck by 9 
blows; viz. 
yds. foot tons. 
7 //, 0 steel shot with velocity due to 600 1 1497 
§"•0 „ „ 1000 2 3472 
9"*22 /, „ 1000 1 2666 
9"'22 „ , 600 1 2969 
9"*22 cast-iron shot „ 1000 1 2666 
10"-0 steel shot „ 1000 1 2838 
10"-0 „ „ 600 2 6292 
9 ) 22,400 
Average blow.2489 foot tons. 
This shield then, has received about two-thirds as much battering as the 
other, but considering that its surface is only one-third of the surface of 
the other, it may be said to have had the more severe trial of the two. It 
# Half value is added for No. 1054, which glanced off the pier on to the shield. 
