THE VALUE OF A HIGH SITE FOR COAST ARTILLERY. 
215 
If j3 be supposed constant, l' approaches a minimum as w approaches 
0°, therefore the flatter the trajectory of the gun, the more its accuracy 
is enhanced, while as co increases, the nearer does the value of l' 
approach that of l, hence as the range increases, the effect of height 
tends to disappear. 
When the effect of shooting is judged by the f overs ’ and the 
* unders,’ as when practising at a Hong Kong Target, the accuracy 
of the practice should bear some relation to the value of T. As 
comparisons of this sort may be of interest, Tables I., II., III. and IV. 
are annexed. Table I. gives the value of (3 for various ranges and 
heights, and the other three give the length of the 50 per cent, zones 
for three guns, that are much used at annual practice. 
TABLE I. Value of the Angle of Depression (f3). 
Height of Site in Feet. 
Range 
in yds. 
25 
50 
75 
100 
125 
150 
175 
200 
225 
250 
275 
300 
100 
0 / 
4 16 
o t 
9 28 
O / 
14 75 
o / 
18 26 
0 / 
21 48 
0 t 
26 27 
o / 
30 41 
O / 
33 19 
o / 
36 35 
0 / 
39 48 
o / 
42 32 
45 0 
250 
1 54 
3 48 
5 42 
7 36 
9 28 
11 18 
13 9 
14 55 
16 52 
18 26 
20 8 
21 48 
500 
57 
1 54 
2 51 
3 48 
4 45 
5 42 
6 40 
7 36 
8 51 
9 27 
10 23 
11 18 
750 
38 
1 18 
1 54 
2 33 
3 10 
3 49 
4 28 
5 5 
5 46 
6 20 
6 58 
7 36 
1000 
29 
57 
1 26 
1 54 
2 23 
2 52 
3 21 
3 49 
4 24 
4 46 
5 12 
5 41 
1500 
19 
38 
57 
1 17 
1 35 
1 55 
2 13 
2 32 
2 52 
3 10 
3 35 
3 48 
2000 
14 
29 
43 
57 
1 12 
1 26 
1 41 
1 54 
2 7 
2 23 
2 36 
2 51 
2500 
11 
23 
35 
46 
57 
1 9 
1 20 
1 32 
1 44 
1 55 
2 7 
2 17 
3000 
9 
19 
28 
39 
48 
•57 
1 8 
1 16 
1 26 
1 35 
1 44 
1 55 
3500 
8 
17 
25 
33 
41 
49 
57 
1 5 
1 13 
1 22 
1 30 
1 38 
4000 
7 
15 
22 
28 
36 
43 
51 
57 
1 5 
1 12 
1 18 
1 26 
4500 
6 
13 
19 
26 
32 
38 
45 
51 
57 
1 4 
1 10 
1 16 
5000 
6 
11 
17 
23 
29 
38 
41 
46 
51 
57 
1 2 
1 9 
