View of pig iron ingots being stripped from their molds in a Bessemer mill at an unknown manufacturing plant. The Bessemer mill takes its name from the "Bessemer process," an inexpensive industrial method for the mass-production of steel from molten pig iron. This photograph is one of a set of fourteen stereographs detailing the production of iron and steel by various processes.
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“Stripping Moulds from Ingots in Bessemer Mill.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/bg257f05g.
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