Wollaston type goniometer with mirror attachment

Secretan, Paris
Wollaston type goniometer (brass and blackened brass) with mirror attachment, engraved silvered scale and vernier read-out with twin adjusting wheels and fine adjustment. Lead filled brass base with 3 screw leveling feet. Diameter circle 12 cm, height: 20 cm.
Signed on the mirror attachment "SECRETAN | PARIS", and on a trade label to the lid of the case. Ca. 1880.

private collection
Photographs courtesy of Fleaglass.com