View of two workers constructing sand molds for pig iron, an intermediate product of smelting iron ore produced from a blast furnace, at an unknown manufacturing plant. Used to form pig iron ingots, such molds are traditionally formed in sand and feature a branching structure meant to resemble a litter of piglets being suckled by a sow. This photograph is one of a set of fourteen stereographs detailing the production of iron and steel by various processes.
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“Making the Sand Moulds for Pig Iron.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/08612n53m.
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