THE ROYAL ARTILLERY INSTITUTION. 
359 
practice at tlie camp of Chalons in I860, at targets representing a battalion 
in column of divisions, partly at half-distance, partly close. 
Table XY. 
Distance. 
Rounds. 
Per centage 
that struck. 
m. 
yds. 
•63 
1250 
1367 
64 
1550 
1695 
120 
•67 
1900 
2078 
42 
•66 
1950 
2132 
84 
•50 
2000 
2187 
120 
•66 
2700 
2953 
48 
•46 
468 
61-5 
The Armstrong L.S. 20-pr. has been less used than any other of the 
breech-loading guns, and the means of comparing it with the canon de 12 
raye are more scanty. The following practice, however, may be taken as a fair 
example. 
Table XYI. 
Date. 
No. 
of 
Nature 
of 
projectile. 
Corrected 
Mean 
time 
Ranges. 
Mean 
difference 
Mean 
reduced 
deflection. 
rounds 
fired. 
elevation. 
of 
flight. 
min. 
max. 
mean. 
of 
range. 
1862, Jan. 16 
10 
Solid shot. 
O 
2 
/ 
7 
sec. 
2-90 
yds. 
802 
yds. 
907 
yds. 
862 
yds. 
30-1 
yds. 
0-4 
// u 15 
20 
a 
5 
3 
6-30 
1722 
1906 
1832 
45-0 
1-9 
a a 16 
10 
n 
10 
2 
11-50 
2982 
3223 
3103 
74-8 
1-7 
1861, Dec. 13 
10 
Common shell 
0 
28 
not 
observ. 
223 
252 
239 
6-5 
0-1 
n a 
9 
a 
2 
5 
2-94 
823 
984 
898 
40-1 
0-6 
n a 
10 
a 
5 
3 
6-09 
1782, 
1864 
1820 
25-7 
1-2 
a u 
10 
n 
7 
2 
8-29 
2348: 
2445 
2401 
29-8 
3-4 
1862, Jan. 13 
10 
n 
10 
1 
11-50 
3160 
3325 
3234 
35-9 
1-9 
1861, Dec. 18 
10 
Segment shell 
0 
28 
not 
observ. 
222 
252 
237 
6-8 
0-1 
n n 
10 
n 
2 
5 
2-79 
861 
889 
878 
7-4 
0-5 
n n 
10 
n 
5 
3 
6-14 
1755 
1912 
1872 
26-1 
1-3 
n n 
10 
II 
7 
2 
8-31 
2334 
2463 
2418 
39-6 
1-6 
1862, Jan. 3 
10 
II 
10 
1 
11-26 
3227 
3346 
3284 
34-8 
1-8 
The ecarts moyens of the French gun in Table XIY. are extremely irregular, 
and evidently cannot be regarded as average values. Such as they are it 
would appear that the gun is in point of range, more accurate than the 
20-pr. up to nearly 2000 yds., but inferior in accuracy of direction. At 
3000 yds. its inferiority in both respects is decided. 
27. The following resume of the principal particulars relating to the 
several guns is added for convenience of reference; some details having been 
[vol. iv.] 
47 
