TORPEDO BATTERY GUN. 
517 
Range .—The longest range is 3000 to 3500 yds. The angles of 
elevation are as follows :— 
Distance. 
Elevation. 
yds. 
O 
/ 
100 ... 
. 0 
10 
200 . 
. 0 
21 
300 . 
. 0 
33 
400 . 
.. 0 
45 
500 . 
. 0 
58 
600 .. 
.. 1 
12 
700 . 
.1 
27 
800 . 
. 1 
43 
900 . 
. 2 
0 
Distance. 
Elevation. 
yds. 
O 
/ 
1000 . 
18 
1100 . 
. 2 
38 
1200 . 
. 3 
0 
1300 . 
. 3 
23 
1400 . 
. 3 
47 
1500 . 
.. 4 
13 
1600.. 
. 4 
40 
1700 . 
. 5 
11 
1800 . 
.. 5 
49 
These ranges of course vary with the powder charge. 
Rapidity .—The following mean rapidity has been obtained by nieil 
at their first practice with the 1-in. torpedo battery gun 
Four rounds 
at a time. 
8 rounds in 1$ secs. 
20 „ 6 „ 
40 „ 12 „ 
100 „ 58 „ 
Relative rapidity 
per minute. 
. 384 
. 200 
. 200 
. 104 
Penetration of steel plates at ranges of— 
1 English mile at right angles .in. 
1500 yds. „ . i „ 
200 „ at 45° . -I- „ 
200 „ at 80° . i „ 
200 „ at 20° . „ 
100 ,, at right angles . f „ 
Iron plates of about 33 p.c. greater thickness are penetrated at the 
same ranges and angles. 
Ammunition. —Cartridge cases of solid drawn metal. Powder of 
somewhat larger grain than rifle powder of the weight of 625 grains. 
Bullets, sharp pointed, of hardened cast steel with gas check, or — 
envelope, 7J ozs. in weight. 
Weight of Gun. cwt. qrs. lb. 
The gun itself ... 3 3 6 
Marine gun carriage, consisting of (1) a pivot sup¬ 
porting wheel, screws, and bolts. 0 2 25 
Cross head (2) . 1 1 2 
Elevating screws (3), breech apparatus, and handle... 0 1 12 
7 bolts. 0 3 0 
6 3 27 
a 
64 
