VATOR, ” boiling process, the furnace be- | ter going through this process they form the bar iron of com- ing an oven hested to an intense} merce. From the iron.reduced into this form the various heat by a fire urged with a blast | parts used in the construction of iron bridges are made, by IRON… … Fig. 6.—BOILING FURNACE. Fig. 5.—RUNNING METAL INTO PIGS. The inside is lined with fire| Works. The process of rolling toughens the iron, seeming | :aprameeee = = Fig. 7.—CARRYING THE IRON BALLS. to draw out its fibers; and iron which has been twice rolled is brick, covered with metallic ore and…
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