General view of glassblower Joe Skalnican using an automatic calibrating machine to apply calibration marks to a piece of glass manufactured in the Dow Chemical Company's Glass Fabrication department. Founded in 1925, the department was responsible for the fabrication and repair of specialty glass equipment used at the Company's plant in Midland, Michigan. The calibration marks helped to ensure accurate measurements when the glass was used in a laboratory setting.
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Dow Chemical Company. “Automatic Calibrating Machine in Glass Fabrication Department,” October 2, 1957. Dow Chemical Company Historical Image Collection, Box 6, Folder Dow Plant--Glass Laboratory. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/cf95jb894.
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