Antique "compass microscope" with etui, ca. 1780-1800

Description

Offered for bidding is a "compass" single microscope of ca. 1780-1800.
The "Compass Microscope" is named so because of the center hinge, reminiscent of a drafting compass. It was used during the 18th century for inspecting small opaque objects such as fauna or flora. To use the instrument, the user would mount the specimen with the stage forceps and locate it just opposite the lens. The silvered reflecting Lieberkuhn mirror focuses more light on the top surface of the specimen. These microscopes were very popular as pocket field aids for naturalists.
This specific type of late 18th century compass microscopes is often considered to be French.
They come with ebony turned handles and wood (as in this one) or cardboard etuis.
The microscope offered here and its case are in excellent condition and will suit any serious collection of historical scientific instruments.