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Subject Bausch & Lomb Optical Company Remove constraint Subject: Bausch & Lomb Optical Company

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  1. Spectroscope is in the style of the original Bunsen-Kirchhoff design. Triangular glass prism sits on a round, brass dias and is held in place by a metal arm attached to the dias; prism is coated in black paint with only…

    • 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…

    • 1940s

    A: Cast iron base attached to a sloping cast iron upright supporting the reader, prisms, sample cups, plungers, and a mechanism for raising and lowering the sample cups; two metal knobs control the height of the sample…

    • 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…

  2. A: Duboscq type colorimeter, biological, with electric illuminator. Hollow black cast iron base attached to a sloping cast iron upright supporting the reader, prisms, and sample cups; reader detaches with two metal…

  3. Cast iron base attached to a sloping cast iron upright supporting the reader, prisms, sample cups, and a mechanism for raising and lowering the sample cups on a focusing rail; metal knobs on each side control the height…