Wollaston type goniometer

Cary, London
Early Wollaston type goniometer (brass) with engraved scale and vernier read-out with twin adjusting wheels, raised on an inverted V-frame, on mahogany plinth base. Diameter circle 10.7 cm. Stored in a mahogany box (13.4 x 12.7 x 16.7 cm) that also serves as a support for the goniometer during measurements.
Signed on circle "Cary London", ca. 1815. Also engraved on the circle: "DS & A GEO: LAB: 148".

private collection