General view of instrument journeyman Norris Hunemorden servicing a Foxboro recorder, part of the control panel at the Dow Chemical Company's Ethylene Glycol Plant. Hunemorden was a member of Dow's Instrument Department, which was responsible for the installation and maintenance of the assorted apparatus necessary to manage the plant's production facilities and processes. The department notably maintained accurate standards for temperatures, voltage, resistance, flow and pressures against which the plant's instruments were regularly calibrated and checked for accuracy.
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Dow Chemical Company. “Control Panel at Dow Ethylene Glycol Plant,” February 24, 1948. Dow Chemical Company Historical Image Collection, Box 6, Folder Plants--Instrument Department. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/05741s22k.
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