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Chevalier's Achromatic Microscope

Designed by Vincent Chevalier during the mid-nineteenth century, this microscope was the first to employ a system of chromatically corrected lenses in the objective. The microscope body tube is supported on a vertical bar by means of a short arm, with the entire assembly being secured onto a wooden base with a threaded mechanism.

The circular stage is composed of a flat plate with a central hole through which light from a series of apertures may enter the objective. These apertures are placed in a rotating disc that is positioned underneath the stage, which has spring clips to secure the specimen. The plano-concave substage mirror is supported on the vertical bar by means of an adjustable collar, and incident illumination is enhanced through a bi-convex lens mounted to and positioned above the stage. A drawer in the wooden base is used to store accessories such as additional objectives and eyepieces.

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