gtimtiixt ^mtAau. 326 [May 24, 1873. … merce. From the iron. reduced into this form the various ing an oven heated to an intense I'm. 1.—THE PHOSNIXVILLE BLAST FURNACES, parts used in the construction of iron bridges are made, by heat by a fire urged with a blast IBON BRIDGE COHSTBUCTION. (Fig. 6). The cast iron sides of the furnace are…
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