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Subject Refractometers Remove constraint Subject: Refractometers

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    • 1919 – 1926

    A: Refractometer
    Instrument has round cast iron base; on the base is a rectangular glass mirror mounted to allow rotation; a single black pillar supports the prism alidade, the black cylindrical telescope viewer, and…

    • 1937 – 1941

    A: Refractometer
    Instrument has round base with black finish; on the base is a double-sided circular glass mirror mounted to allow full rotation; a black pillar supports the prism alidade, the black brass cylindrical…