细节
An unusual late 18th-century brass horizontal sundial,
signed DOLLOND LONDON, the gnomon set for Latitude 7° 22', with engraved hour ring and calendar scale, 17¾in. (45.1cm.) diam.
See Illustration
signed DOLLOND LONDON, the gnomon set for Latitude 7° 22', with engraved hour ring and calendar scale, 17¾in. (45.1cm.) diam.
See Illustration