126 
MINUTES OF PROCEEDINGS OF 
At one point only (where the 9 lbs. projectiles were used), is there 
any appreciable difference, and this difference is capable of the same 
explanation as has already been given in par. 20, as, from the con¬ 
struction of this projectile, a greater air space was left in the powder 
chamber than in the case of the other projectiles, the position of the 
base of all of which in the bore of the gun was identically the same. 
The annexed tables exhibit an analysis of the results obtained from 
these experiments. 
Table VI. 
Abstract of the Results of the Experiments made to determine the 
Initial Velocity of Projectiles fired from the 1 2-pr. Armstrong Gun , 
the Weight of the Shot being varied. 
Armstrong 
12 -pounder. 
No. 
of 
Rounds. 
Charge. 
Projectile. 
Velocity 
at 
30 Yards. 
Initial Velocity. 
Weight. 
Diameter. 
Observed. 
Computed. 
lbs. oz. 
lbs. oz. 
r 
11 
1 8 
11 13 
3-084 
1164*5 
1173*4 
— 
No. 224 < 
11 
99 99 
11 5 
3-084 
1192-9 
1202-5 
— 
l 
10 
99 99 
10 13 
3-084 
1209-8 
1220 1 
— 
r. 
5 
9 0 
3-074 
1322-3 
1336-3 
1384-0 
6 
99 99 
11 9 
3-084 
1227*4 
1237*2 
1237*0 
No. 1,050 1 
6 
99 99 
24 6 
3-084 
853-9 
856-7 
860-3 
1 
6 
99 99 
35 14 
3*084 
720*0 
721-5 
710-1 
f 
5 
99 99 
47 13 
3-084 
613*9 
614-8 
618-1 
Table VII. 
Table showing the Velocity of Projectiles of various Weights fired 
from a 12 -pr. Armstrong Gun. 
Charge. 
Weight 
of 
Shot. 
Initial 
Velocity. 
Charge. 
Weight 
of 
Shot. 
Initial 
Velocity. 
Charge. 
Weight 
Shot. 
Initial 
Velocity. 
lbs. oz. 
lbs. OZ. 
ft. 
lbs. 
oz. 
lbs. oz. 
ft. 
lbs. 
oz. 
lbs. 
oz. 
ft. 
1 8 
9 
0 
1380 
1 
8 
22 
0 
900 
1 
8 
35 
0 
730 
„ „ 
10 
0 
1321 
23 
0 
881 
36 
0 
720 
99 99 
11 
0 
1266 
24 
0 
864 
37 
0 
710 
99 99 
12 
0 
1213 
25 
0 
850 
38 
0 
700 
99 99 
13 
0 
1174 
26 
0 
835 
39 
0 
691 
99 9 9 
14 
0 
1134 
27 
0 
827 
40' 
0 
682 
99 99 
15 
0 
1095 
28 
0 
810 
41 
0 
673 
99 99 
16 
0 
1060 
29 
0 
797 
42 
0 
664 
99 99 
17 
0 
1027 
30 
0 
785 
43 
0 
655 
99 99 
18 
0 
997 
31 
0 
773 
44 
0 
646 
99 99 
19 
0 
970 
32 
0 
762 
45 
0 
638 
99 99 
20 
0 
945 
33 
0 
751 
46 
0 
630 
” » 
21 
0 
923 
34 
0 
740 
47 
0 
622 
Variation in Initial Velocity between high and low Gauge Projectiles 
(Armstrong). 
24. The experiments numbered XLIV. to XL VII. were made with 
a view to ascertain whether there is any difference in velocity between 
projectiles of the highest and lowest gauges admitted into the service. 
The results of these experiments are here given, and it will be seen 
that there exists between the velocities no appreciable difference. 
