View of two workers using a rolling mill to compress and lengthen billet blooms, a semi-finished steel product often transformed into finished products like rails or wire rods, at an unknown manufacturing plant. This photograph is one of a set of seven stereographs detailing the production of steel.
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“Billet ‘Blooms’ for Rails Being Further Compressed and Lengthened in Rolling Mill.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/8w32r5616.
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