.jpg?w=1)
Details
An early 19th-Century lacquered-brass swinging-arm protractor,
signed on the alidade Troughton London, the two swinging arms with pointers, with finely divided circle, with rack and pinion adjustment, with detachable magnifier, contained in the shaped mahogany case -- 7in. (17.8cm.) dia.
See Illustration
signed on the alidade Troughton London, the two swinging arms with pointers, with finely divided circle, with rack and pinion adjustment, with detachable magnifier, contained in the shaped mahogany case -- 7in. (17.8cm.) dia.
See Illustration