Wollaston type goniometer
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
(cut at edge). Diameter circle 11.2 cm. Stored in a plush-covered
ebonized base and glass dome. Signed on circle "Cary
London", ca. 1815.