Signed "Nachet et Fils, Rue Serpente 16, a Paris", this all-brass horizontal microscope was made by Nachet & Son in the 1860s. The original model, from which our 3-D Studio Max drawing is derived, resides in the Billings Microscope Collection at the National Museum of Health and Medicine at Walter Reed Army Hospital in Washington, D. C.

The circular conical base is leaded for support and is attached to a tubular pillar having a rack on the rear side with a heavy collar. The horizontal body tube is positioned at the top of the pillar by a double milled-head pinion. Focusing is achieved with a rack and pinion mechanism that moves a draw tube within the main body tube. The ocular screws into the body, which also contains an eye and field lens. A horizontal bar holds both a rectangular stage (with specimen clips) and a gimbal for the single mirror.

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