THE EOYAL ARTILLERY INSTITUTION. 
251 
long grass in a continuous line for 19 yds., the ground here dipped a little, 
but the trace was distinguishable further on, shewing that it conld not have 
risen so much as a foot for 120 yds. A 40-pr. shot fired at 7i°, charge 
24 oz., struck the ground at 980 yds., and skimmed along until stopped by 
the shoulder of the battery at 1060 yds., not rising above 2 or 3 ft. It will 
be seen however by the distance of the second graze from the first as given 
in column 7, that with these rare exceptions, the effect of each shot will be 
confined to the portions of the descending and rising branches of the curve 
comprised between the ordinary height of a parapet and the ground—a 
distance of 100 to 150 ft. according to the angle. There is scarcely any 
chance of shot which fall short, getting into the work on second graze, a 
thing which frequently happens with round shot and shells, 
12. The Committee do not consider it necessary to expend more ammu¬ 
nition in endeavouring to strike the half-sunken field magazine, which has 
not yet been struck, or to obtain more direct evidence of the effect of a blow 
on guns and gun carriages; they recommend that the use of the 12-pr., 
20-pr., and 40-pr. Armstrong guns with reduced charges at high angles, be 
reduced to practice, and recognized as an occasional employment of those 
guns, and that the Commanding Officers, Eoyal Artillery, receive instructions 
to keep a careful record of the results of all shots which take effect on 
material as well as of the actual first grazes for given charges and elevations, 
to verify the annexed table. They would also suggest that orders be given 
to the' P. S. S. to issue fresh (unserviceable) carriages instead of some of 
those now in the work, which are too much shattered to furnish any longer 
a fair illustration of the effects of shot. 
(Signed) J. St GEOEGE, 
President O. S. C. 
Table Yin. 
GIVING THE APPROXIMATE ELEVATIONS NECESSARY TO PITCH AN ARMSTRONG 
SHOT OR SHELL INTO A WORK AT THE DISTANCES SPECIEIED, AND WITH 
THE CHARGES GIVEN. 
o 
L. 
S. 12-pr. 
L. 
S. 20-pr. 
L. S. 40-pr. 
§ O 
Elevation for 
Elevation for 
Elevation for 
-Sis 5 
M O 
p 
oz. 
oz. 
oz. 
oz. 
oz. 
oz. 
oz. 
oz. 
oz. 
oz. 
6 
8 
10 
14 
16 
18 
24 
28 
32 
36 
yds. 
0 / 
o , 
o , 
o , 
o / 
o , 
o , 
o , 
o / 
o / 
500 
5 6 
600 
5 54 
700 
6 42 
4 15 
6 20 
4 50 
5' 30 
800 
8 0 
5 10 
7 4 
6 30 
4 50 
6 15 
5 20 
900 
9 30 
6 5 
4 40 
7 46 
6 13 
5 30 
7 8 
6 5 
5 5 
1000 
6 58 
5 20 
8 30 
6 56 
6 10 
7 55 
6 45 
5 45 
5 0 
1100 
8 6 
6 4 
9 10 
7 40 
6 50 
8 35 
7 30 
6 30 
5 40 
1200 
9 20 
6 46 
9 50 
8 25 
7 40 
9 25 
8 12 
7 10 
6 20 
1300 
7 40 
9 10 
8 23 
9 0 
8 0 
7 0 
1400 
8 40 
10 0 
9 10 
9 46 
8 45 
7 40 
1500 
9 40 
9 55 
9 30 
8 25 
1600 
9 15 
