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The direction of immediate improvement In ordnance for iron-clad warfare appears to be the abandonment of cast-iron, except as a barrel to be strengthened by steel; binding an inner tube with low-steel hoops having a successively increasing initial tension; and the use of spherical shot at excessive velocities by means of high charges of powder in bores of moderate diameters.
Krupp is now introducing the Bessemer process for producing ingots of any size at about the cost of wrought-iron. These and other makes of low-steel have endured extraordinary tests in the form of small guns and other structures subject to concussion and strain; and both the theory and all the evidence that we have promise its superiority for gun-metal.
On the whole, then, hooping an inner steel tube with successively tighter steel rings, or, what is better, tubes, is the probable direction of improvement in heavy ordnance. An inner tube of iron, cast hollow on Rodman's plan, so as to avoid an inherent rupturing strain, and hooped with low-steel without welds, would be cheaper and very strong.
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