View of two workers drawing off molten iron from a blast furnace to make pig iron, an intermediate product of smelting iron ore, at an unknown manufacturing plant. This photograph is one of a set of fourteen stereographs detailing the production of iron and steel by various processes.
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“Drawing off Molten Iron from Blast Furnace to Make ‘Pigs.’” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/h415p9546.
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