THE ROYAL ARTILLERY INSTITUTION. 85 
Iii order to allow the examples given in this essay to be followed 
throughout, the corresponding practice tables for the short 15 c.m. B.L. 
gun are appended. 
Although I have endeavoured to discuss the problem of curved fire—- 
so interesting to all artillerists—from a practical rather than a theo¬ 
retical point of view, on the basis of the experience already gained, I 
cannot hope to offer to those who are already well acquainted with the 
literature of this subject anything essentially new. This essay may pos¬ 
sibly, however, give rise to discussions upon the subject of this kind of 
fire, and the difficulties in its employment which present themselves. 
Such discussions would be the means of thoroughly ventilating the 
question, and would certainly lead to valuable suggestions being made. 
Practice Table . 
Nature of Ordnance .—Short 15 c.m. B.L. Gun. Jump Projectile .—Common shell, calibres in 
or angle by which the discharge increases the ele- length. Charge, 0 - 9 k.g. 
vation ( Efhebungswinlcel ) 6'. 
6 
b£ 
c3 
M, 
Deflection. 
Height of tangent sight. 
Angle of elevation. 
Angle of descent. 
Time of flight. 
Final velocity. 
Space within 
which 50 per cent, 
of the shells 
strike. 
Lateral and vertical dis¬ 
placement of the point of 
impact corresponding to an 
alteration of 3 m.m. (or about 
5') in the deflection and ele¬ 
vation respectively. 
Alteration of range for 
every 5' (or about 3 m.m.) 
of elevation. 
Lateral displacement of the 
point of impact correspond¬ 
ing to every 3 m.m. of the 
index-plate of the aligning 
apparatus. 
Length. 
Breadth. 
.2° 
*53 
M 
metres. 
m.m. 
c.m. 
° 
' 
o 
' 
secs. 
metres. 
100 ... 
1-5 
3-35 
0 
47 
0 
53 
0-56 
'177-2 
3-72 
0-07 
0-06 
0-14 
1 9-5 f 
0-09' 
200 ... 
2-5 
6-40 
1 
41 
1 
48 
1-14 
176-0 
4-85 
0-14 
0-15 
0'29 
1 90 l 
0-19 
300 ... 
4-0 
9-65 
2 
35 
2 
44 
1-72 
174-7 
5-97 
0-22 
0-28 
0-43 
) ( 
0-28 
400 ... 
5'5 
12-95 
3 
30 
3 
40 
2-31 
173-5 
7-10 
0 30 
0-45 
0-57 
r s ‘° i 
0-38 
500 ... 
7-0 
18-40 
4 
26 
4 
39 
. 2-91 
172-3 
8-23 
0-39 
0-66 
0-71 
0-47 
600 ... 
8*5 
19-85 
5 
23 
5 
38 
3-52 
171-2 
9-34 
0-48 
0-91 
0-86 
0-57 
700 ... 
10*0 
23-40 
6 
20 
6 
39 
4-15 
170-0 
10-49 
0-57 
1-21 
1-00 
[ 8-5 ] 
0 66 
800 ... 
11*5 
27-00 
7 
19 
7 
42 
4-78 
168-8 
11-59 
0-6S 
1-56 
1-14 
) l 
0-76 
900 ... 
13-5 
3070 
8 
18 
8 
46 
5-43 
167-7 
12-74 
0-78 
1-95 
1-29 
0-85 
1000 ... 
150 
— 
9 
19 
9 
52 
6-10 
166-6 
13-87 
0-89 
2-40 
1-43 
f 8 '° \ 
0-95 
1100 ... 
16 - 5 
— 
10 
21 
11 
0 
6-78 
165"5 
14-99 
1-00 
2-89 
1-57 
> l 
1 04 
1200 ... 
18-5 
' '- 
11 
25 
12 
10 
7-48 
164-4 
1613 
1-12 
3-45 
1-72 
\ 7 .K f 
1-14 
1300 ... 
20-0 
-- 
12 
31 
13 
22 
8-21 
163-3 
17-25 
1-25 
4-08 
1-86 
; 75 1 
1-23 
1400 ... 
22-0 
— 
13 
38 
14 
37 
8-93 
162-3 
18-38 
1-37 
4-76 
2-00 
1-32 
1500 ... 
24-0 
JB 
14 
47 
15 
55 
9-69 
161-3 
19-51 
1-51 
5 "53 
2-14 
; /0 1 
1-42 
1600 ... 
26-0 
— 
15 
59 
17 
16 
10-47 
160-3 
20-64 
1-64 
6-38 
2-29 
l 6-5 f 
1-51 
1700 ... 
28-5 
Jsjl 
17 
13 
18 
40 
11-29 
159-4' 
21-77 
1-78 
7-31 
2-43 
; 60 1 
1-61 
1800 ... 
30-5 
— 
18 
31 
20 
9 
12-13 
158"5 
22-89 
1-93 
8-34 
2-57 
X 6*0 f 
1-70 
1900 ... 
33-0 
— 
19 
52 
21 
41 
13-01 
157-6 
24-02 
2-08 
9-49 
2-72 
5 60 1 
1-80 
2000 ... 
35-5 
21 
18 
23 
20 
13-94 
156-8 
25-15 
2-24 
10-78 
2-86 
5-5 
1-89 
