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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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rubbed over with graphite. While the plates are being rolled, the edges are kept free from gaps by paring them with large shears. They are then placed in packs of from 10 to 20 on a moving bench, which passes them to and fro under a hammer of 40 poods' weight; both sides are alternately exposed to its action, and a man carefully brushes off the scales that are continually produced on the surface. The parings are mixed with half their weight of charcoal and converted into bar-iron. Herbert Barry, late director of estates and ironworks of Vuicksa, thus describes the manufacture: — The refined iron is hammered under the tilt-hammer into narrow slabs, calculated to produce a sheet of finished iron, 56 inches by 28 inches, weighing when finished from 6 to 12 pounds. These slabs are put in the reheating-furnaces, heated to a red heat, and rolled down to a sheet in three operations. These are subsequently hammered to reduce the thickness and confer the glance. A number of these sh