细节
A MID-18TH CENTURY DAVIS QUADRANT (BACK-STAFF) BY CHARLES DIGBY
the ebony frame with boxwood arcs, the smaller with 8in. radius divided from 0°- 60°, the larger arc with 24½in. radius divided 0°- 25°, signed on inset boxwood plaque Made by Charles Digby near the Hermitage Stair LONDON (some old staining, wear, all vanes and sights missing), overall length -- 25½in. (65cm.)
See illustration