THE ROYAL ARTILLERY INSTITUTION. 
197 
Table I. 
Abstract* showing the velocity of solid shot fired from a 68-pr. unbushed gun 
(Expl. No. 242), with the cartridge made up of different lengths and diameters. 
Calibre of gun 8T2 inches. 
See Table II. for ranges. 
Charge... 16 lbs. 
Solid shot, weight. 66*5 lbs. 
„ diameter. 7’92 ins. 
Brand of powder, L.G., W.A., 15/8/63, Lot 623. 
No wads used. 
Date of experiment, 2/2/64. 
'K w 
O ra 
6 § 
& 2 
Cartridge. 
Observed velocities at 30 yds. 
Calculated 
mean 
initial 
velocity. 
Remarks. 
Mean 
length in 
the bore. 
Mean 
diameter. 
Min. 
Max. 
Mean. 
in. 
in. 
ft. 
ft. 
ft. 
ft. 
15 
10-37f 
7-4 
1523-9 
1572-7 
1543-0 
1669-0 
15 
10-90 
7-5 
1519-2 
1567-6 
1550-4 
1576-6 
15 
11-68 
7-0 
1528-6 
1561-0 
1549-8 
1576-0 
15 
13-45 
6-5 
1486-7 
1528-7 
1513-0 
1538-0 
15 
15-35 
6-0 
1448-2 
1497-5 
1477-8 
1502-0 
Table II. 
Besult of 100 rounds of solid spherical shot, weight 66*5 lbs., fired from the 
unbushed 68-pr. (Expl. No. 242), to test range, accuracy, and recoil, with 
elongated cartridges. Charge 16 lbs. 
Elevation by spirit level, axis of gun 17*5 feet above plane. 
© 
Cartridge. 
o 
Ranges. 
Mean difference 
of range. 
Mean observed 
deflection. 
Mean reduced 
deflection. 
Date. 
§ 
c 
f-i 
'o 
6 
£ 
Corrected e' 
vation. 
Gauge. 
Mean 
length 
in the 
bore. 
Mean 
recoil. 
Mean time 
flight. 
Min. 
Max. 
Mean. 
1864. 
O / 
in. 
in. 
ft. 
sec. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
Eeb.2. 
15 
2 17 
( service } 
1 7-4 1 
J 
10-37 
6-94 
3-43 
1119 
1336 
1225 
61*1 
5-1 
2-9 
II 
15 
a 
i * j 
7-5 
10-90 
6-42 
3-31 
1092 
1326 
1190 
58-5 
2-8 
2-5 
II 
15 
n 
7-0 
11-58 
7-20 
3-41 
1121 
1321 
1221 
41-5 
3-9 
1-6 
II 
15 
n 
6-5 
13-45 
6-76 
3-27 
1114 
1300 
1173 
46-8 
3-7 
2-2 
il 
15 
,i 
6-0 
15-35 
6-34 
3-39 
1166 
1261 
1200J 
22 - 53 : 
4-7J 
1-6J 
Eeb.4. 
5 
5 10 
f service ■( 
1 7-4 J 
> 
10-37 
6-07 
6-64 
1904 
2085 
1991 
55-0 
23-3 
3-7 
II 
5 
n 
7-5 
10-90 
5-92 
6-86 
1968 
2123 
2043 
54-6 
21-6 
5-8 
II 
6 
u 
7-0 
11-58 
6‘35 
6‘72 
1915 
2148 
2023 
84-0 
13-5 
3-6 
II 
5 
n 
6-5 
13-45 
5*97 
6-66 
1965 
2033 
1998 
26-6 
13*3 
5-4 
II 
5 
100 
a 
6-0 
15-35 
5-55 
6-54 
1881 
1985 
1928 
38-2 
16-2 
6-0 
* The time for this experiment was three and a half hours, during which the velocities, length 
of cartridge, ranges, &c. of 75 rounds were accurately recorded, 
f Cartridge supposed to have been rammed up slightly harder than the others, 
j Means of 11 rounds, the other 4 shots having grazed on the water. 
