View of a worker inserting a steel ingot, a piece of relatively pure material cast into a shape suitable for further processing, into a rolling mill at an unknown manufacturing plant. During the production of steel, mills are used to shape the steel into various forms, such as plates or rails. This photograph is one of a set of seven stereographs detailing the production of steel.
“Steel Ingot Entering First Rolling Mill to Be Rolled into Plates or Rails.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/bn9996734.
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