Made by an unknown artisan around 1830, this simple brass microscope has a monocular eye lens. 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 revolving disc has a diameter of almost two inches, and is supported by a quarter-inch tube attached to an arm in the center. There are six diaphragm/specimen holders in the disc for mounting a variety of specimens. The eye lens is secured into one end of the arm, and a handle for holding the microscope is attached to the other end.

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