PRINCIPLES OP GUNNERY. 
427 
o5 
Ele¬ 
vation. 
Mean 
Ranges 
Mean 
Mean 
lateral 
devia¬ 
tion. 
Mean 
Date, and wind. 
ti 
§ 
Gun. 
time of 
flight. 
Min. 
Max. 
Mean. 
error in 
range. 
lateral 
error. 
CO 
o 
h-* 
10 
Short 
O 
3 
secs. 
4*32 
yds. 
1513 
yds. 
1581 
yds. 
1547 
yds. 
17-2 
yds. 
3*08 R. 
yds. 
0-42 
—>• 2 to 4 
n 
10# 
Long 
3 
4‘44f 
1558 
1698 
1637 
30*2 
4’20 a 
1-38 
10 
Short 
5 
6-64 
2248 
2315 
2278 
15-8 
8*24 a 
1-33 
—>• 0 to 1 
a 
10 
Long 
5 
6-81 
2357 
2413 
2387 
17-9 
9-02 a 
1-23 
5. 2. 74. 
10 
Short 
10 
12-24J 
3689 
3868 
3736 
41-4 
9-22 a 
3-06 
-s-V/f 
1 to 2 
n 
10 
Long 
10 
12-47§ 
3794 
3973 
3898 
43-6 
12-10 a 
3-44 
* Mean of 9 rounds; 1 omitted as being irregular, 
f n 8 ,, 1 not observed ; 1 omitted as being irregular. 
J a 8 rounds ; 2 not observed. 
§*9,1 
To show how the mean time of flight, mean range, mean error in 
range, mean lateral deviation, and mean lateral error are obtained, 
the result of each of 10 rounds fired from the long 40-pr. gun at 
5° elevation is given in detail. 
j No. of rounds. 
Elevation. 
Charge. 
j Weight of 
projectile. 
Time of flight. 
Range. 
Lateral 
deviation. 
Lateral 
error. 
1st graze and 
mean. 
| Difference of 
j each range 
| from mean. 
Left. 
Right. 
Left. 
j Right. 
| 
O 
lbs. 
lbs. 
secs. 
yds. 
yds. 
yds. 
yds. 
yds. 
yds. 
1 
5 
7 
38| 
6-8 
2396 
9 
— 
9 
•02 
2 
n 
a 
n 
6-8 
2386 
1 
— 
8-4 
_ 
•62 
3 
n 
n 
n 
6-8 
2375 
12 
_ 
10 
_ 
•98 
4 
ii 
n 
ii 
6-8 
2357 
30 
— 
7 
_ 
2-02 
5 
ii 
n 
ii 
6-9 
2410 
23 
— 
7-2 
_ 
1-82 
6 
n 
a 
n 
6-7 
2361 
26 
_ 
10-2 
_ 
1-18 
7 
ii 
n 
n 
6-8 
2413 
26 
— 
9 
_ 
•02 
8 
ii 
a 
n 
6-8 
2403 
16 
.—, 
7-4 
_ 
1-62 
9 
n 
n 
n 
6-9 
2401 
14 
_ 
9 
_ 
•02 
10 
ii 
n 
ii 
6-8 
2365 
22 
— 
13 
— 
3-98 
10 J 
68-1 
23867 
179 
— 
90-2 
— 
12-28 
6-81 
2387 
17-9 
— 
9-02 
— 
1-23 
The mean time of flight is 6’81 sees. 
Mean range . 2387 yds. 
n error in range . 17*9 » 
a lateral deviation ... 9‘02 • right 
i „ error. 1'23 , 
