THE ROYAL ARTILLERY INSTITUTION, 
443 
A, 
Fire of Siege and Garrison Steel 1 2-pr. Common Shell . 
Charge/ 2-08 lbs. 
1 
2 
3 
4 
5 
6 
7 
8 
Iuj 
hi 3 
5 § 
a ^ 
.2 .a 
-g V 
d 
CD 
$ 
Cw § 
Distance. 
Height oi 
tangent sig 
a ^ 
o 
•-S.S 
o 
CD 
5F) 
CD 
fi 
^ % m 
•S in -g 
a 6 g 
.Soto 
■e 43 a 
r o5 rH 
I 6 o 
£ s o 
a <D 
^ nd 
a p| 
Angle 
of elevatioi 
Angle 
of incidenc 
Tangent o 
ngle of incid 
Kl o 
a 
yds. 
tenths' 
of in. 
tenths 
of in. 
yds. 
ft. 
0 / 
o / 
■ 
59 
13 
0 
45 
0-5 
0 12 
0 13 
0-0038 
117 
2-6 
0 
44 
1*0 
0 25 
0 27 
0-0079 
175 
4-0 
0 
42 
1-6 
0 38 
0 42 
0-0122 
233 
5-4 
0 
. 41 
2-0 
0 51 
0 58 
0-0169 
292 
6-8 
0 
40 
2‘5 
1 5 
1 14 
0-0215 
350 
8-3 
0-1 
39 
2-9 
1 19 
1 31 
0-0265 
408 
9*8 
0-1 
38 
3-4 
1 34 
1 48 
0-0314 
467 
11-4 
0*2 
37 
3-9 
1 49 
2 5 
0-0364 
525 
13-0 
0-3 
36 
4-4 
2 5 
2 22 
0-0413 
583 
14*7 
0-4 
34 
4-9 
2 21 
2 40 
0-0466 
642 
16-4 
0'5 
33 
5-4 
2 37 
2 58 
0-0518 
700 
18-2 
0-6 
32 
5-9 
•2 54 
3 16 
0-0571 
758 
20-0 
0-7 
32 
6-3 
3 11 
3 34 
0-0623 
817 
21-8 
0-8 
32 
6-8 
3 28 
3 52 
0-0676 
875 
23-6 
0-9 
31 
7-3 
3 45 
4 10 
0-0729 
933 
25-4 
1-0 
31 
7-8 
4 3 
4 29 
0-0784 
992 
27-3 
1-1 
30 
8-3 
4 21 
4 48 
0-0840 
1050 
29-2 
1-2 
30 
8-8 
4 39 
5 7 
0-0896 
1108 
31-2 
1-3 
29 
9-3 
4 58 
5 27 
0-0954 
1167 
33-2 
1-4 
29 
9-8 
5 17 
5 47 
0-1013 
1225 
35-2 
1-5 
29 
10-2 
5 36 
6 8 
0-1075 
1283 
37-2 
1 1-6 
29 
10-7 
5 55 
6 30 
0-1139 
1342 
39-3 
1-7 
28 
11*2 
6 14 
6 54 
0-1210 
1400 
41-4 
1-9 
28 
11*7 
6 34 
7 20 
0-1287 
1458 
43-5 
2-0 
28 
12*2 
6 54 
7 48 
0-1370 
1517 
45-6 
2-2 
28 
12-7 
7 14 
8 18 
0-1459 
1576 
47-8 
2-3 
27 
13-2 
7 34 
8 50 
0-1554 
1633 
50-0 
2*5 
27 
13-6 
7 54 
9 24 
0-1656 
This table is obtained thus :— 
Column 1.—In this column are set down the ranges at convenient 
equidistances. 
Columns 2 and 6.—One of these columns is obtainable from the other. 
If the tangent-sight bar is divided to degrees and minutes, and the 
curves previously described have been plotted accordingly, the height 
on the tangent-sight bar is obtained by multiplying the tangent of the 
angle of elevation by the radius for sighting (in this piece 35*9"); or 
in symbols 
h == r tan 0; 
h being the height on the tangent-bar required,, r the radius for sight¬ 
ing, and 0 the angle of elevation. If, on the other hand, the tangent- 
sight bar is divided into inches, the angle of elevation is obtained from 
the formula reversed, 
h 
