View of a worker removing a flattened sheet of glass from a lehr, a temperature-controlled kiln used to slowly cool hot glass, at an unidentified factory. This photograph is one of a set of seven stereographs detailing the production of glass sheets.
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“Taking Flattened Sheet of Glass from Lehr in the Furnace.” Underwood & Underwood, n.d. Underwood & Underwood Stereographs of Manufacturing Industries. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/dv13zt216.
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