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Harper's Encyclopedia of United States History (ed. Benson Lossing) 1 1 Browse Search
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Harper's Encyclopedia of United States History (ed. Benson Lossing), Cannon, (search)
ece of heavy ordnance cast at the South Boston foundry, a 10-in. columbiad, under the supervision of Colonel Bomford; weight, 14,500 lbs.; shot, 130 lbs.; shell, 90 lbs.; charge of powder, 18 lbs., Sept. 6, 1839. Character of gun iron definitely fixed by the metallo-dynamoter, a testing-machine invented by Major Wade, 1840. First 12-in. columbiad; weight, 25,510 lbs.; extreme range, 5,761 yds.; weight of shell, 172 lbs.; charge of powder, 20 lbs.; cast at the South Boston foundry, July 8, 1846. Dahlgren gun, of iron, cast solid and cooled from the exterior, very thick at breech and diminishing to muzzle; first cast, May, 1850. Rodman gun, a columbiad model, smooth-bore, made by the Rodman process of hollow casting, cooled from the interior; adopted by the United States for all sea-coast cannon, 1860. First 10-lb. Parrot gun, of iron, cast hollow, cooled from the inside and strengthened by an exterior tube made of wrought-iron bars spirally coiled and shrunk on; made a