350 
MINUTES OF PROCEEDINGS OF 
Averages for Armstrong B,L. I2~pr. 
Elevation. 
Range. 
Mean diff. 
Mean reduced 
of range. 
deflection. 
2° 
1087 
17*2 
0-6 
5° 
2086 
19.5 
1*3 
10° 
3410 
36‘5 
2*9 
There may be a question whether the Armstrong 9-pr. has any substantial 
advantage over the Erench canon de 4 raye, but there can be scarcely any 
as to the relative efficiency as concerns range and accuracy of the Armstrong 
12-pr., and this indeed the least that we could expect from its greater 
weight and less general mobility. 
11. The Erench gun appears in the preceding comparisons as we have 
found it on trial. The following table is based on very extensive practice 
at La Eere, and doubtless gives a more just representation of its average 
accuracy. 
Table VII. 
Distance. 
Elevation. 
Mean error 
Extreme errors or 
rectangle including 
In 
range. 
In 
direction. 
all the shots. 
Length. 
Width. 
metres. 
yds. 
O 
/ 
yds. 
yds. 
400 
437 
0 
55 
9-8 
0*38 
IM 
• •• 
600 
656 
1 
30 
18*6 
0-55 
41-5 
4-3 
800 
875 
2 
10 
21*8 
0-87 
900 
teo 
• •• 
78 V 7 
4-3 
1000 
1094 
2 
”50 
24*0 
1-31 
• •a 
1200 
1312 
3 
40 
25-1 
1*53 
60-3 
6-5 
1600 
1614 
5 
5 
27*3 
2-08 
32*5 
7-6 
1800 
1969 
6 
35 
29-5 
2-73 
43*7 
10-9 
2000 
2187 
7 
45 
30-6 
3*27 
• •• 
... 
2100 
• •• 
lf 
M| 
55*8 
9-8 
2400 
0*0 
e 
|B 
M| 
117-0 
10-9 
2500 
2734 
11 
0 
32-8 
6-03 
• •• 
2700 
000 
• •• 
131-2 
17-5 
3000 
3281 
15* 
10 
37*2 
7*00 
76-5 
29-5 
The mean errors (ecarts moyens ) above appear to be the same thing as the 
mean error of range and mean reduced deflection of our tables. The ecarts 
maxima are not given for the same mean ranges in all cases, but I have 
included the whole of them. 
12. Lastly, we have the results of target practice at the Camp of 
Chalons in 1860. 
The following table contains, Eirst the number of hits on a target 2 metres 
(6 ft. 6 inches) square, and the number in line but over or under not more 
than 30 metres. Second, the number which struck targets representing a 
battalion in column of divisions, whether at half-distance or closed up. 
The practice was in both cases assimilated as much as possible to actual 
service, that is to say, the fire was sustained and rapid \ the distances were 
not known to the batteries. 
