A brass universal equinoctial ring dial, the meridian ring with sliding suspension ring, engraved on one face with scale for Northern and Southern latitudes, 83°-0°-90°, by 1°, for use as an altitude quadrent with plumb line originall secured to the small pierced for that purpose, the pivoted equinoctial ring with hour scale twice twelve hours marked in Roman numerals divided to 1/8th of an hour, the bridge with sliding pin-hole sight, with scale of months and zodiac scale with declination, divided to 1°, the Vernal Equinox given as 10 March -- 4 1/8in.(10.5cm.) diam. | Christie's

拍品 262

262

A brass universal equinoctial ring dial, the meridian ring with sliding suspension ring, engraved on one face with scale for Northern and Southern latitudes, 83°-0°-90°, by 1°, for use as an altitude quadrent with plumb line originall secured to the small pierced for that purpose, the pivoted equinoctial ring with hour scale twice twelve hours marked in Roman numerals divided to 1/8th of an hour, the bridge with sliding pin-hole sight, with scale of months and zodiac scale with declination, divided to 1°, the Vernal Equinox given as 10 March -- 4 1/8in.(10.5cm.) diam.

細節

A brass universal equinoctial ring dial, the meridian ring with sliding suspension ring, engraved on one face with scale for Northern and Southern latitudes, 83°-0°-90°, by 1°, for use as an altitude quadrent with plumb line originall secured to the small pierced for that purpose, the pivoted equinoctial ring with hour scale twice twelve hours marked in Roman numerals divided to 1/8th of an hour, the bridge with sliding pin-hole sight, with scale of months and zodiac scale with declination, divided to 1°, the Vernal Equinox given as 10 March -- 4 1/8in.(10.5cm.) diam.

更多詳情

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拍品專文

The form of the engraved numerals resembales those found on instruments signed by Thomas Wright (1686-1748), Mathematical Instrument maker to George, Prince of Wales from 1718.