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This Ellis-Type Aquatic microscope has a tubular pillar attached to the box-foot. The pillar supports the stage, mirror, and an optical system consisting of a single lens. The instrument is also fitted with a screw-barrel microscope. The wooden box, covered with fish skin, contains accessories, including brass and ivory sliders, and Lieberkuhn reflector. This is the oldest instrument in the Collection. Signed: Dollond London.