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in the New York Mercantile Advertiser and republished in the Aurora General Advertiser. A footnote on Mitchill's article said "This gun is a new invention, cast at Foxall's foundery, on the Potomac. It is different from the English carronade, and has been proved to carry a shot at the distance of 600 yards through a breastwork thicker than the sides of a ship of the line, with the addition of 8 feet of earth and faschines behind it." Experiments on the utility of the columbiads were carried out

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