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An 1872 diagram of a hot-blast furnace
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The development of the "hot-blast" process created a new market for anthracite as a fuel for the iron industry. Early blast furnaces were made of stone and were often 50 feet high or taller. This diagram is from 1872.

Credit: Library of Congress

The development of the "hot-blast" process created a new market for anthracite as a fuel for the iron industry. Early blast furnaces were made of stone and were often 50 feet high or taller. This diagram is from 1872.

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