NEW AUSTRIAN 6-IN. BRONZE-STEEL GUN. 
421 
It will be seen that the two bronze-steel guns give about the same 
ballistic results. 
Ve¬ 
locity 
at 
muzzle 
Energy at muzzle. 
Cali¬ 
bre. 
Relation of 
per lb. 
of 
charge. 
Per in. 
of shot’s 
circumf. 
Nature of gun. 
G-un. 
Shell. 
Powd. 
charge 
weights of shell 
and charge. 
ins. 
cwt. 
lbs. 
lbs. 
twist | 
(15 cm ) (" _ . . C 
6 in.gn. J " 2 ^creasing „ | 
(149) 
5*87 
(144) 
5-87 
(3225) 
63*2 
(3235) 
63*7 
(38*8) 
85*5 
(38*8) 
85*5 
(8*0) 
17*6 
(8*0) 
17 *6 
0-206... 
=0-206... 
1469 
1476 
1156 
1290 
69 
70 
Krupp (15 cm ) 6-in. steel") 
gun, tried in 1874 .. ) 
(149*1) 
5*9 
(2983) 
58*7 
(32*32) 
71*1 
(6*5) 
14*3 
j * = 0-201... 
1536 
1085 
58 
Long Austrian (15 cm ) 6-in. 1 ) 
marine gun (cast-iron, > 
strengthened) . j 
(149*1) 
5*9 
(4000) 
78*7 
(35*5) 
78*1 
(8*0) 
17*6 
} ib = °' 225 - 
1531 
1270 
68 
The 6-in. guns of bronze-steel thus gave a muzzle velocity of about 
1476 f.s., and had at (50 m ) 164 ft. from the muzzle an energy per inch 
of shot's circumference, and consequently a penetrative power against 
plates, greater than the steel 6-in. gun of Krupp, and about the 
same as the long marine 6-in. gun, although the latter had at that 
range a somewhat greater remaining velocity. 
Judging from former experiments, this amount of energy would be 
sufficient to perforate wrought-iron plates (16 cm ) 6*3 ins. in thickness, 
together with their wood backing, at some distance. 
It was decided, therefore, that the guns in question could be used 
with advantage as auxiliary pieces in coast batteries, for firing against 
armour-clad ships. 
Accuracy of Fire. 
The practice to determine the above, carried out in series of 
20 rounds from each gun, at ranges of (1000 m ) 1094 yds., (2000 m ) 
2187 yds., and (3000 m ) 3281yds., showed that both guns gave very 
good shooting, and that there was apparently but little difference 
between them. To obtain a more complete comparison, three series 
of 20 rounds were fired from each gun at a range of (2000 m ) 2187 yds. 
Further, in order to test the effect of the wear of the bore upon the 
accuracy of fire, the total number of rounds fired from each gun was 
brought up to 300, by firing at the same range comparative series of 
25 rounds each. 
Notwithstanding the comparatively large number of rounds fired, 
no diminution of accuracy of fire could be observed. 
Lastly, in order to determine the relative superiority of the two 
guns, two series of 20 rounds were fired with projectiles the copper 
rings or belts of which had been turned down to (0*3 mm ) 0*012 in. 
below their proper size. This gave a condition representing a con¬ 
siderable wear of the bore, and enabled one at the same time to fix 
upon the limits of error to be allowed in manufacture of the projectiles. 
The following table gives the results obtained during these experi¬ 
ments, together with the comparative results given by the steel ringed 
