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Subject Voltmeters Remove constraint Subject: Voltmeters

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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…

    • after 1888

    Direct current voltmeter, Model 1. Instrument mounted on brown felt on a hardwood base, with a brass tag in front; instrument made of metal and finished in orange-brown; two electrical connections covered in black…

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Instruments for measuring both voltage and amperes of direct electric current.