THE EOYAL AETILLEEY INSTITUTION. 
169 
On the gun being thoroughly cleaned and examined, it was found that 
one of the flaws which existed in the bore of the gun previous to this 
experiment had slightly increased. 
September 25th. 
Range 800 yds. Charge 74*40 lbs. Solid cast-iron shot * mean weight 
284 lbs. 13 oz. Yelocity at 780 yards 1299*2. 
The same target was used as on the 16 th of September. 
New shot were made for this experiment, whereby the windage was 
reduced to *1305. 
1st round. Missed the target; the shot struck the masonry some yards 
to the left. Elevation 57k 
2nd round. Elevation 1°. The shot grazed 17 yds. 1 ft. in front of the 
target, which it struck at the junction of the middle and lower plates 3' 
from the right side, making an irregular hole 2' x 1' 11" in the armour- 
plate ; the shot broke up and was buried in the backing, the depth from the 
surface of the plate to the broken shot being T; the lower plate was forced 
down 1*3" from the hole to the right side, and the centre plate had started 
to the front 1*2" at the bottom, between the hole now made and the one 
made at the last experiment; cracks already on the plate much opened, and 
several new ones (one being V 9" long) made on the centre plate. At the 
back two ribs broken completely through, one being driven in 4", and a 
length of 2' of the other doubled back, and resting on the ground; the skin 
considerably bulged out and opened at the joint, but not cracked; four 
bolts and one rivet driven out some inches, and three bolt-heads broken off. 
No buckling of the plate. 
3rd round. Elevation 1° 5'. Missed the target and penetrated the 
backing of the old “Warrior” target some yards to the right; did great 
havoc on brickwork, wood supports, &c. in the rear, some large pieces of 
wood being picked up 60 yds. in rear. 
4th round. Elevation 1° 2'. The shot struck the left top corner of the 
upper plate, and broke off a piece of plate measuring 2' horizontally x 1/ 6" 
vertically; no cracks on the plate; one bolt driven out, and one started 
2*5." The backing and skin at the top of the target very much shaken. 
The skin forced back 8" (in the greatest depth) for a length of 4', and the 
damage extended down the target for 5' from the top; the front baulks of 
the backing forced out for a depth of 2' 1" from the top, and three of the 
rear baulks much splintered. The outer rib broken through vertically for a 
length of 2' 6" from the top, and doubled up 4", only now measuring 6" in 
depth. 
No increase in the flaws in the gun after this day's firing. 
One round bf solid cast-iron shot was fired from a 68-pr. 95 cwt. gun, at 
200 yds. range, at the left side of the lower plate, to test the quality of the 
metal, and made an indent of 4*05"; two large and two small cracks on the 
face of the indent, and large cracks on the plate parallel to the circum¬ 
ference of the indent, and 5" below it, extending upwards for T on each 
side. The iron was very brittle, irregular, and largely crystalline, and 
seemed unfit for armour plates. 
* These shot had been annealed and were very tough. 
