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Updated: May 29, 2025
The air shook with a tremendous detonation; sand and stones flew all around, and the suffocating powder-gas took everybody's breath away; but gradually the soldiers began to recognize one another through the dust and smoke, thankful at finding themselves uninjured. "Captain!" called a weak voice from the bottom of the trench, "Captain Lange, I'm wounded."
"If we follow the usual proportions," replied Morgan, "a diameter of 800 inches demands sides two feet thick at least." "That would be much too thick," answered Barbicane; "we do not want a projectile to pierce armour-plate; it only needs sides strong enough to resist the pressure of the powder-gas.
It is probable that powder-gas, from the excessive suddenness of its generation, exerts a percussive as well as a statical pressure, thus requiring great elasticity and a certain degree of hardness in the gun-metal, as well as high tensile strength. Cast-iron and bronze are obviously inadequate.
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