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Subject Scientific apparatus and instruments--Calibration Remove constraint Subject: Scientific apparatus and instruments--Calibration

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    • 1948-Feb-24

    General view of Instrument calibrationist August Aaron checking the calibration of a voltmeter in the Dow Chemical Company's Instrument Department. Established in 1926, the Instrument Department was responsible for the…

    • 1948-Feb-24

    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…

    • 1948-Feb-24

    General view of the Instrument Department workroom at the Dow Chemical Company plant located in Midland, Michigan. Established in 1926, the Instrument Department was responsible for the installation and maintenance of…

    • 1948-Feb-24

    General view of the Instrument Department workroom at the Dow Chemical Company plant located in Midland, Michigan. Established in 1926, the Instrument Department was responsible for the installation and maintenance of…

    • 1930s

    The McLeod Gauge measures very low pressures of gasses. Its presence in this collection indicates that it was used during the production of Beckman Instruments' early pH meters. These calibrations may have been written…

    • 1934-Mar-22

    These calibrations and the diagram were done by W. E. Baier, Research Manager of the California Fruit Growers' Exchange. The McLeod Gauge measures very low pressures of gasses. Its presence in this collection indicates…