354 
MINUTES OE PROCEEDINGS OE 
18. The projectiles are the same as those used for field service, namely 
Weight empty. 
Common shell.3*66 kil. 8*08 lbs. 
Shrapnel (1858)... ...2*75 „ 6'06 „ 
„ (1864).2-60 „ 5*73 „ 
Case shot 
As fired, 
4-00 kil. 8-82 lbs. 
4*21 „ 9-28 „ 
4-72 „ 10-41 „ 
4-72 „ 10-41 „ 
Thus the gun is 25 times the weight (m) of its ordinary projectiles 
(common shell), and the charge about th, giving an initial velocity (F) of 
225 m. or 738 ft., the weight of the carriage with 29*5 in. wheels is 206 lbs.; 
the total weight of gun and carriage (M) 427 lbs., and we have for the 
velocity of recoil (v), 
v = — r=i4-o ft. 
M 
This high value indicates a very sharp recoil, which is home out by the 
following table. 
Actual recoil of.the mountain gun . 
Elevation. 
0° 
5° 
15° 
On heavy wet soil ...... 
ft. 
7*8 
11-7 
19*2 
ft. 
8-8 
15-6 
ft. 
7-4 
On good turf not dry . 
On medium earth, such as the drill ground at Vincennes 
19. The construction of the carriage permits a depression of 8° and an 
elevation of 15°, which commands a range of 2000 yds. The following 
table gives the particulars of practice with common shells. 
Table IX. 
Practice of French rifled canon de 4 raye de Montague, 
Distance. 
Angle of 
elevation. 
Angle 
of 
de scent. 
Derivation. 
Highest 
point of 
trajectory. 
Time 
of 
flight. 
Mean errors. 
Striking 
velocity. 
Range. 
Direction. 
metres. 
yds. 
o 
/ 
O 
f 
yds. 
yds. 
s. 
yds. 
yds. 
ft. 
200 
219 
0 
45 
0 
65 
0-5 
0-9 
0*9 
703 
300 
328 
1 
15 
1 
25 
0-8 
2-2 
1*3 
689 
400 
438 
1 
45 
2 
5 
1-3 
4-4 
1*8 
6*6 
6 V 4 
672 
600 
647 
2 
20 
2 
50 
2-2 
6-5 
2*3 
656 
600 
656 
2 
55 
3 
35 
3*3 
10-9 
2*9 
120 
0*8 
640 
700 
765 
3 
30 
4 
35 
4-7 
15-3 
3*4 
623 
800 
875. 
4 
5 
6 
25 
6-3 
19-7 
4-0 
14*2 
1*1 
607 
900 
984 
4 
45 
6 
35 
8*3 
26-2 
4*6 
691 
1000 
1094 
5 
30 
7 
40 
10-6 
33-9 
5*0 
17*5 
1*3 
574 
1200 
1203 
7 
15 
10 
10 
16-7 
64-8 
6*2 
19*7 
2*2 
645 
1500 
1640 
10 
40 
14 
30 
29*2 
100-6 
8*3 
21*9 
3*3 
605 
1800 
1969 
13 
35 
19 
25 
10*6 
24*0 
6*6 
466 
2000 
2187 
16 
20 
22 
60 
63-4 
200*1 
12*5 
26*2 
12*0 
440 
