198 
MINUTES oe proceedings oF 
The gun was on a garrison sliding carriage on a dwarf traversing 
platform, with slope 5°. No compressors were used. The platform was 
wet throughout. 
These results proved that the effect of elongating the cartridge 5 inches, 
and reducing the diameter of it from 7*4 to 6*0 inches, had the effect of 
reducing the initial velocity by 67 feet, and the range by 25 yards and 63 
yards, at the respective elevations of 2° 17' and 5° 10'. 
5. In order to verify these results, the Committee directed the experi¬ 
ment to be repeated with cartridges of 7*5, 7*4, 7‘2, and 7*0 inches 
diameter. 
The following tables give the results. 
Table III. 
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. 
See Table IV. for ranges. 
Charge. 16 lbs. 
Solid shot, weight . 66’5 lbs. 
„ diameter . 7'92 in. 
Brand of powder, L.Gf., W.A., 15/8/63. Lot 623. 
Date of experiment, 31/3/64*. 
No. 
Cartridges. 
Observed 
Calculated 
of 
rounds. 
Mean length 
in the bore. 
Mean 
diameter. 
mean velocity 
at 30 yards. 
mean initial 
velocity. 
Remarks. 
in. 
in. 
ft. 
ft. 
15 
10-41 
7*4 
1548-8 
1571-0 
No wads used. 
16 
10-33 
7-5 
1553-1 
1580-3 
15 
10-52 
7-2 
1550-1 
1576-3 
15 
11-58 
7-0 
1540-4 
1566-6 
Table IV. 
Report of firing 60 rounds from the above gun, with cartridges made of different 
lengths and diameters. 
Charge _ 16 lbs. Solid shot . 66*5 lbs. 
For velocities, see Table III. 
Date, 
No. of 
rounds. 
Gauge of 
cartridge. 
Corrected 
elevation.* 
Mean time 
of flight. 
Ranges. 
Mean 
difference 
of range. 
Mean 
observed 
deflection. 
Mean 
reduced 
deflection. 
Min. 
Max. 
Mean. 
1864. 
in. 
o / 
sec. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
March 31 
15 
7-4 
2 17 
3-29 
ii5i 
1.361 
1217 
39-4 
4-4 
2-5 
/; 
15 
7-5 
2 16 
3-29 
1142 
1362 
1228 
45-7 
4-5 
2-8 
a 
15 
7-2 
2 16 
3-45 
1190 
1356 
1258 
39-2 
6-0 
2-0 
n 
15 
7-0 
2 16 
3-44t 
1120 
1291 
1241+ 
27-3+ 
4-6+ 
2-4+ 
* Elevation by quadrant. 
t Means of 12, the tide being on the range when the last three rounds were fired. 
