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Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
on, produced by passing the hot sheet, moistened with a solution of wood ashes, between polished steel rollers. Most of the attempts to imitate the Russia sheetiron have been to give it a surface of carburet of iron. Probably the most reliable description accessible is that given by Captain Meshtcherkin, a Russian mining-engineer conversant with the manufacture, to Dr. Percy. According to this officer, the manufacture is principally confined to the eastern or Asiatic side of the Ural Mountains. Charcoal iron from magnetic ore, carbonate, or red and brown hematite, and refined in the charcoal finery or the puddlingfurnace, is employed. It should be rather crystalline than fibrous, and contain sufficient carbon to render it somewhat steely. The puddle-halls are rolled into bars 5 inches wide by 1/4 inch thick. Either one or two pairs of rolls, making not less than 50 revolutions per minute, are employed. The sheets are extended under a trip-hammer (a, Fig. 4507) having