ce of the intense tempera- tures the oxygen leaves the iron ore by means of iron tools, work up the and combines with the carbon of the fused materials so as to expose them to fuel, while the earthy matter associates the action of the gases of combustion. itself with the limestone to form the By… … and to render' it fit for wider industrial FIG. 6. — A CAST-IRON MEDALLION OF uses. The older method of further LOUIS XV. purification was known as refining, and the English puddling furnace practice the plant for permitting this operation cast-iron is melted on the hearth of the to be performed…
Engineering
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