Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 65
time were small square walled-in structures only 3 or 4feet high, and their effect would not greatly exceed that of a smiths forge :but as improved blowing apparatus gave more power, they soon becameenlarged into oval or round brick towers from 10 to 15 feet high, and they,like the small furnaces,… … Fig. 17.—Blast Furnace {Obsolete Type). to turn out malleable metal, but they produced instead the cruder sub-stance we call white pig iron, and this requires much subsequent treat-ment before it is converted into malleable or merchant iron. Never-theless the demand for cast iron as such, and more…
Inventions
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