Men Sitting on pig Iron at the Jones & South Side Works, Pittsburgh, PA, 1885.
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Men sitting on stack of Pig Iron, ca. 1885.

Credit: Library and Archives Div., Historical Society of Western Pa., Pitts.

The source of the metal used in puddling furnaces was pig iron, a crude iron cast in blocks that was the product of the primary iron-producing unit called the blast furnace. By 1880 the Jones & Laughlin South Side Works had an annual capacity of 65,000 tons.

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