SHORT NOTES ON THE 13-PR. M.L. GUN. 
167 
13-pr . Rifled M.L. Gun. 8 cwt. Charge , B lbs. 2 ozs. R.L.G? Projectile , 
common shell or shrapnel , 73 4 005 . M.V. — 1595 f.s. 
0 
Stf) 
a 
Drift, right. 
Elevation. 
i 
Deflection, left. 
Time of flight. 
i: 
1 Angle of descent. 
1 
Remaining velocity. 
5' elevation increase or de- 
1 crease, range by 
5' will alter point of impact, 
! vertically or laterally, at 
each range. 
60 per cent, of 
rounds fired should 
fall within 
Fuze 
scale. 
1 ' 
Length. 
Breadth. 
1 
| Height. 
CD 
fcUD 
g 
P3 
Length of fuze. 
yds. 
yds. 
0 
l 
0 / 
secs. 
0 / 
f.s. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
500 
0-08 
0 
19 
0 1 
1-28 
0 51 
1376 
65-5 
0-72 
4-70 
0-30 
0-06 
480 
2-0 
1000 
0-40 
1 
6 
0 1 
2-56 
1 59 
1195 
50-0 
1-45 
12-15 
0-77 
0-36 
960 
4-5 
1500 
1-22 
2 
2 
0 3 
3-87 
3 21 
1060 
41-6 
2-18 
18-00 
1-14 
1-02 
1470 
7-5 
2000 
2-45 
3 
6 
0 4 
5-30 
6 1 
974 
35-7 
2-91 
23-25 
1-44 
2-05 
1990 
11-0 
2500 
4*20 
4 
22 
0 6 
6-90 
7 1 
914 
29-4 
3-63 
27-75 
1-69 
3-45 
2500 
15-0 
3000 
6-70 
5 
47 
0 8 
8-78 
9 21 
862 
29-4 
4-36 
31-95 
1-92 
6-30 
2980 
19-5 
3600 
10-30 
7 
18 
0 10 
10-87 
12 6 
816 
25-0 
5-09 
35-40 
2-12 
7-60 
3500 
25-0 
4000 
16-45 
9 
0 
0 14 
13-10 
15 6 
774 
23-8 
6-81 
38*40 
2-28 
10-40 
3900 
30-0 
6000 
39-70 
13 
1 
0 27 
17-92 
22 10 
703 
17-2 
7-27 
46-94 
2-69 
— 
— 
— 
6000 
107-50 
19 
6 
1 2 
23-70 
30 42 
644 
9-8 
8-73 
57-44 
3-15 
— 
— 
— 
The increments of fuze are exceedingly good, as will be seen from 
the following table :— 
Increment, one to 
Range. one division of fuze. 
Up to 480yds.. 120yds. 
480 u 
780 
is 
.. 100 
II 
780 „ 
1230 
II .. 
. 90 
II 
1230 , 
1710 
u «•*•»»««» 
......... 80 
II 
1710 . 
2000 
. 70 
II 
2000 „ 
2300 
II ......... 
.. 65 
n (average.) 
2800 „ 
2620 
II ......... 
......... 60 
n 
2620 „ 
3280 
II ......... 
.. 50 
11 
3280 . 
3460 
u •«••••»« * 
.. 45 
11 (average.) 
3460 „ 
3900 
a ......... 
.. 40 
II 
The cones of dispersion are not given, bnt the writer has reason to 
believe, from a few diagrams of practice at Shoeburyness, that they do 
not materially differ from those of the 16-pr. in the earlier ranges; he 
would therefore be inclined to suggest the following as approximate :— 
Up to 1000 yds. ... 8° 
1000 ,, 2000 u .... 9 ° 
2000 u 8000 „ .. 10 ° 
8000 . 4000 , ... 11° 
20 
