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Georges Oberhauser Compound Monocular Drum Microscope

This brass compound monocular microscope was made by German instrument maker Georges Oberhauser sometime before 1840. The model featured below was redrawn from photographs of the original microscope, which is part of the Billings microscope collection at Walter Reed Army Hospital in Washington DC.

The drum-style microscope has a Fraunhofer-type body that can be screwed into a circular leaded base or to the top of the microscope's box container. A small stage is fixed in place with a revolving disc of diaphragms below the opening at the back of the body. There is a single internal mirror positioned on a milled-head pivot to provide illumination for the specimen, and a bull's-eye condenser (also on a pivot) attached with a small arm. The body tube slides into a flanged tube above the tube and is moved up and down for coarse focus adjustment of the single objective.

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