THE ROYAL ARTILLERY INSTITUTION. 
123 
Table III. 
Table showing the Initial Velocities of the various Service Projectiles 
fired from the under-mentioned Guns. The velocities printed in 
italics are observed. The remainder are calculated from the data 
furnished by the observed velocities. 
Nature of Ordnance. 
Calibre. 
Projectile. 
Wind¬ 
Initial 
Nature. 
Weight. 
age. 
Velocity. 
10 in.-gun, 87 cwt. 
10 
lbs. 
12 
Hoi. shot - 
lbs. 
88-475 
•142 
Peet per sec. 
* 270 ’4 
>9 99 
8 
Mar. sh. - 
117-14 
•1425 
930'4 
99 99 
SJ 
12 
Com. sb. - 
92-625 
*15 
1257-5 
99 
Case 
77-625 
•18 
1353-7 
„ „ 
8*12 
99 
Grape 
83*375 
•18 
1308-1 
68-pr. 95 cwt. - 
16 
Shot 
66-224 
•168 
4579-0 
,, ,, 
.. 
Nav. sh. - 
51-5 
•17 
4809 • 9 
99 99 
99 
10 
Com. sh. - 
49*875 
•226 
4190'7 
„ 5, 
Mar. sh. - 
60-0 
•235 
4308'5 
16 
Diapli. sh. 
60-75 
•195 
1627-9 
“5 ,, 
Case 
45-687 
•265 
1818-1 
99 99 
99 
Grape 
63-5 
•3 
1475-3 
8 in.-gun, 65 cwt. 
8-05 
10 
Hoi. shot - 
46-007 
•21 
1W9 
99 
9 
Com. sh. - 
49-875 
*194 
4464 * 4 
99 99 
)} 
99 
Mar. sh. - 
51-5 
•13 
4506' 4 
99 99 
9 
Diaph. sh. 
60-75 
•125 
1356-9 
•9 99 
Case 
45-687 
•195 
1712-7 
32-pr. 58 cwt. - 
6*375 
99 
Grape 
66*5 
•23 
1214-4 
10 
Shot 
31*375 
*196 
469O'O 
99 
8 
}) 
31-389 
•194 
4648'7 
99 99 
99 
6 
Com. sh. - 
31-349 
•195 
W5 
99 99 
99 
10 
24-312 
•198 
1912-6 
99 99 
99 
Diaph. sh. 
28-75 
*198 
1762-4 
99 99 
99 
9 
Case 
36-094 
•228 
1543-8 
99 99 
9 
Grape 
36-25 
•228 
1540-3 
24-pr. 50 cwt. - 
5*823 
8 
Shot 
23-047 
•208 
4720'S 
99 
Com. sh. - 
17-5 
•228 
1948-2 
99 99 
99 
99 
Diaph. sh. 
20-875 
•228 
1786-0 
»» „ 
99 
99 
Case 
25-594 
•2435 
1594*7 
» „ 
Grape 
26 0 
•253 
1571-6 
18-pr. 38 cwt. - 
5*292 
6 
Shot 
17-656 
•205 
469O'6 
Com. sh. • 
13-125 
*193 
1971-6 
99 9 9 
99 
99 
Diaph. sh. 
15*875 
•193 
1797-3 
99 99 
99 
99 
Case 
19-562 
*218 
1588-5 
12-pr. 18 cwt. - 
4*623 
99 
Grape 
19*5 
•218 
1591-2 
4 
Shot 
12-656 
*803 
4769-8 
Com. sh. - 
9-0 
*169 
1987-4 
99 99 
99 
99 
Diaph. sh. 
10-375 
*169 
1854-7 
99 99 * 
99 
Case 
16-625 
*159 
1489-8 
9-pr. 13 cwt. - 
4*2 
2*5 
Shot 
9-359 
*1 
4643'1 
Diaph. sh. 
8-062 
•12 
1707-3 
99 99 
99 
99 
Case 
13-0 
•1315 
1318-8 
6-pr. 6 cwt. 
3*668 
1*5 
Shot 
6-23 
•1 
4484.-5 
99 
99 
Diaph. sh. 
5-125 
•118 
1608-8 
- 
99 
Case 
8-5 
•1275 
1215*8 
12-pr. Howr. 6| cwt. 
4*58 
1*25 
Com. sh. - 
9-0 
•126 
4444-6 
99 99 
Diaph. sh. 
10-465 
•126 
1058*1 
- 
99 
2*5 
Case 
8-118 
•148 
1185-5 
24-pr. Howr. 12 cwt. 
5*72 
Com. sh. - 
17-5 
•125 
4222'9 
99 99 
99 
99 
Diaph. sh. 
20-875 
•125 
1113-0 
” ” ' 
Case 
14-014 
*15 
1369-9 
Variation of the Initial Velocity of the \2-pounder Armstrong in terms 
of the Weight of the Charge. 
16. The decrease in the range of the 12-pounder Armstrong, due to 
a slight reduction of the charge, had not, in experimental practice, 
escaped the notice of the Ordnance Select Committee, and it became 
a point of interest to determine the dependence of the initial velocity on 
the charge, and to ascertain if it followed even approximately the same 
laws as have been laid down for smooth’bored guns. 
