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One sided flat mirror mounted to rotate in all directions by means of two semi-circular brass bars turned by worm gears and marked in degrees; the head piece is mounted on brass post on a brass cylindrical casing housing a clock mechanism that drives the two counter dials on the platform; all suspended on two brass posts with screw adjustment and protractor for precision adjustment of angle; on flat brass round base with levelling bubble and three levelling screw legs marked “153”; key attached to turn clock mechanism and partially adjust mirror angle; marked “J. Duboscq à Paris, no. 188”

Accession Number: 2009.uc.18

Alternative Name:

Primary Materials: Metal, Brass, Copper, Glass


Dimensions (cm): 38 x 26.5 x 26.5 cm


Provides a constant source of intense natural light. A clockwork mechanism adjusts a mirror in order to direct sunlight in a fixed direction. Uses include dark field microscopy and photomicrography.


Good. The metal surface shows some small scratches and some signs of corrosion.

Associated Instruments:

Manufacturer: J. Duboscq, Paris

Date of Manufacture: c. 1880


Additional Information and References:

Historical Notes: