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细节
An 18th-Century English brass universal equinoctial ring dial,
unsigned -- 10.1cm. (4in.) diameter
See Colour Illustration
The chapter ring is graduated on one side in hours I-XII (x2), labelled every hour and with 7½-minute subdivisions. These are repeated but unlabelled on the inside edge. The other side has a declination scale 0-90°. This corresponds directly to a scale on the meridian ring. The other side of the meridian is graduated in two quadrants of 1-90°, with 1° subdivisions. The throne and suspension loop are lacking. The bridge has a sliding pin-hole sight. On both sides it is labelled N and S at either end and has a calendar scale with initials for the months on one side, and a Zodiac scale on the other, with a corresponding scale 20-0-20 initialled Æ.
unsigned -- 10.1cm. (4in.) diameter
See Colour Illustration
The chapter ring is graduated on one side in hours I-XII (x2), labelled every hour and with 7½-minute subdivisions. These are repeated but unlabelled on the inside edge. The other side has a declination scale 0-90°. This corresponds directly to a scale on the meridian ring. The other side of the meridian is graduated in two quadrants of 1-90°, with 1° subdivisions. The throne and suspension loop are lacking. The bridge has a sliding pin-hole sight. On both sides it is labelled N and S at either end and has a calendar scale with initials for the months on one side, and a Zodiac scale on the other, with a corresponding scale 20-0-20 initialled Æ.
注意事项
No VAT will be charged on the hammer price, but VAT at 17.5% will be added to the buyer's premium which is invoiced on a VAT inclusive basis