Rome instrument maker Guiseppe Campani made this tripod compound monocular microscope in the mid to late seventeenth century. The model featured below was redrawn from a photograph of the original microscope, which is part of the Billings microscope collection at Walter Reed Army Hospital in Washington DC.

The body is constructed of turned ivory and is secured by a carved horn socket pressed within a silver ring. Scrolled silver legs connect the ring to the ebony base. The eye lens is positioned within a screw-threaded draw tube, and a movable ivory stage at the center of the base doubles as a screw cap for the lens. This microscope is described as extremely rare with no duplicate ever having been discovered.

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