View of an apparatus for applying a coat of lime onto molds filled with pig iron, an intermediate product of smelting iron ore produced from a blast furnace, at an unknown manufacturing plant. When processing iron ore into steel, lime forms a highly basic slag, a stony waste matter that is separated in order to refine or purify the iron ore. This photograph is one of a set of fourteen stereographs detailing the production of iron and steel by various processes.
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“Apparatus for Blowing Coat of Lime on Moving Pig Moulds after Use.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/zw12z529z.
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