SILVER MEDAL PRIZE ESSAY, 1898. 
305 
Table F. 
To show effect on energies of Recoil of varying (1) weight of gun and 
carriage, marked A ; (2) weight of projectile, marked B ; (3) muzzle 
velocity, marked C and D. 
Distinguishing 
Mark 
Projectile 
Weight 
of Gun and 
Carriage 
lbs. 
Recoil 
Weight 
lbs. 
M.V. 
Velocity, 
ft. secs. 
Energy, 
ft. tons 
A 
12 
1400 
2500 
6*7 
0-75 
A 
12 
1400 
2000 
8-4 
0'95 
B 
15 
1400 
2000 
10*5 
1'45 
B 
IO 
1400 
2000 
7 
065 
C 
15 
1500 
2000 
11-25 
1-75 
0 
15 
IOOO 
2000 
7*5 
0-75 
D 
10 
1500 
2000 
7-5 
0-75 
D 
10 
IOOO 
2000 
5 
0 34 
N.B.—Of course intermediate values can be interpolated between the extremes 
of each pair. The variable is emphasized in each case. 
Table G. 
Comparison of remaining velocities at different ranges due to a 
reduction of muzzle velocity from 1540 f.s. to 1400 f.s. in a 12-pounder 
projectile. 
Remaining Velocities at 
Muzzle 
1000 yds. 
2000 yds. 
3000 yds. 
4000 yds. 
1540 
1400 
1137 
1059 
947 
907 
823 
793 
726 
699 
Differences 
140 
78 
40 
30 
27 
Percentage of velo¬ 
city lost 
9 p.c. 
6-8 p.c. 
4-2 p.c. 
36 p.c. 
3-7 p.c. 
Table H. 
INTENSITY OF Fire. —Comparison of the number of bullets per 
minute which could be delivered on an enemy’s position by a Battery 
equipped with the 15-pr. and one equipped with the 12-pr. Q.F. 
Weight 
No. of 
No. of rounds 
No. of bullets 
Equipment 
of projectile, 
bullets in 
which 
delivered 
lbs. 
shell 
can be fired in 
per minute on 
one minute 
enemy’s position 
Service, 15-pr.... 
14 
200 
6 
1200 
12 -pr. Q.F. 
12 * 
162 
j 20 
1 80 
f 3240 
\ 4860 
A difference in effect which must be quite overwhelming. 
