xpensive paper for the purpose of presenting a few reflections alteration in which, by the addition of a mandrel, on the subject of ordnance. rest and a roller adjusting itself to the ever-increas- ing mandrel mass, would enable me to construct a CANNON NOT SO GOOD NOW AS THEY WERE FIFTY YEARS mass… … ever or by whatever prin- red-hot plate on its central MODE OF MAKING CANNON. ciple they are cast, are mandrel. Now a plate of charcoal iron, called ingots, welded together. Mr. iron thus heated hot and wound up on its man- only in a crystallized fort. Krupp, of Essen, in Prussia, is the inventor…
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