THE ROYAL ARTILLERY INSTITUTION. 
249 
Date. 
No. 
Charge. 
Eleva¬ 
tion. 
Effects. 
First 
Grazes. 
1861. 
oz. 
o , 
32-pr. of 25 cwt.— Continued . 
yds. 
Oct. 30 
6 
22 
7f 0 
Into parapet. 
1002 
7 
— 
7f 0 
Over ..... 
— 
8 
_ 
7f 0 
Into the ditch of the work at about. 
1000 
9 
_ 
7f 0 
Struck the bonnette high . 
960 
10 
— 
7f 0 
Into the work . 
1010 
Nov. 6 
11 
_ 
7f 0 
Rather short... 
910 
12 
— 
7f 0 
Struck a wooden platform without causing 
serious splinters, and into traverse 3. 
1015 
13 
_ 
7f 0 
Short, struck the bonnette on second graze. 
_ 
14 
_ 
7f 0 
Into the work . 
995 
15 
__ 
7f 0 
do ... 
1008 
16 
_ 
7f 0 
Went clear over the butt .about 
1160 
17 
_ 
7f 0 
Struck the butt high .about 
1100 
18 
_ 
7f O 
Struck the butt .about 
1055 
19 
_ 
7f 0 
Passed through an iron gabion and buried itself 
in the cheek of an embrasure . 
1025 
20 
_ 
7f 0 
Into the work behind traverse 3 . 
1010 
21 
— 
7f 0 
Grazed the rear of traverse 2, carrying away 
2 gabions . 
990 
22 
— 
7f 0 
Into traverse 3. 
1020 
8. The results of the foregoing practice may be stated generally as 
follows:— 
Armstrong. 
1 Smooth-bore. 
40-pr. 
1 
20-pr. 
12-pr. 
Total, i 
I 
1 i 
.8-inch. 32-pr. 
| Total. 
Shots which fell in the work, or on the 
parapet. 
17 
2 
6 
24 
7 
10 
17 
Shots caught by the bonnette which would 
have otherwise entered the work. 
2 
8 
6 
16 
0 
1 
1 
Short. 
2 
12 
11 
25 
13 
3 
16 
Over. 
0 
0 
0 
0 
2 
8 
10 
9, It will be seen that very little material was struck, there was conse¬ 
quently little opportunity of judging of the effect of Armstrong projectiles 
in dismounting ordnance. It has however been ascertained that the initial 
velocity of the 12-pr. shell is as follows:— 
With charge 6 oz. 500 ft. per second. 
„ 8 oz. 620 ft. „ 
„ 10 oz. 732 ft. „ 
It is probable that these velocities will be very near the truth for charges 
of the other natures bearing the same proportion to the weight of the shot, 
namely, for the 40-pr.—20 oz., 26*6 oz., and 33*8 oz.; for the 20-pr.— 
10-5 oz., 14’0 oz., and 17*5 oz; and their mechanical effects can therefore be 
easily compared with those of smooth-bored projectiles if we also ascertain the 
