View of a worker transferring a cylinder of glass into a flattening oven at an unidentified factory. This photograph is one of a set of seven stereographs detailing the production of glass sheets.
“Shover Boy Shoving Cylinder into Flattening Oven.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4q77fr33m.
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