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Employee transporting sheets of glass produced by compressed air process

ca. 1923

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Employee transporting sheets of glass produced by compressed air process
  • Title
  • Employee transporting sheets of glass produced by compressed air process
  • Creator
  • PPG Industries
  • Date
  • ca. 1923
  • Identifier
  • 20170227-hpichswp-0025
  • Description
  • Employee transporting sheets of cut glass produced by the compressed air process. In this process, glass cylinders are formed by a machine that pushes compressed air through a cap in a manner that mimics the historic, hand-blown method. Once the glass reaches the desired length, large cradles are raised and adhered to the cylinders in order to safely lower them to the ground floor of the plant. Once cooled, the glass is cut using a hot wire method. The cut glass is then reheated in order to flatten each sheet of glass. This process of compressed air glass manufacturing was used by Pittsburgh Plate Glass Company until 1927-1928 when the company adopted the Pennvernon process.
  • Type
  • still image
  • Genre
  • photographs
  • Subject
  • PPG Industries.
    Glass manufacture.
    Glassworkers.
    African Americans.
  • Source
  • PPG Industries Records, 1888-1995, MSS 667, Detre Library and Archives, Senator John Heinz History Center
  • Contributor
  • Detre Library & Archives, Heinz History Center
  • Collection
  • PPG Industries Records
  • Rights Information
  • Copyright Not Evaluated. The copyright and related rights status of this Item has not been evaluated. Please refer to the organization that has made the Item available for more information. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use.
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