Many methods of padding the shell have been devised
for reducing the shock in powder guns, but the variability of the
powder pressure is too great to have yet rendered any such method
successful. A method was patented by Gruson in Germany of filling a
shell with the two harmless constituents of an explosive and having
them unite and explode by means of a fulminate fuse on striking an
object. He used for the constituents nitric acid and dinitro-benzine,
and was quite successful; but the system has not met with favor, on
account of the inconvenience. The explosive was about four times as
powerful as gunpowder.
That the advantage of using the most powerful explosives is a real one
can be easily shown. The eight inch pneumatic gun in New York harbor,
with a projectile containing fifty pounds of blasting gelatine and
five pounds of dynamite, easily sunk a schooner at 1,864 yards range
from the torpedo effect of the shell falling alongside it.
This same shell, if filled with gunpowder, would have contained but
twenty-five pounds, and have had but one-ninth the power.
The principal European nations are now building armored turrets sunk
in enormous masses of cement, as a result of their experiences with
gun-cotton and melenite.
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