Equinoctial Ring. 18th-century brass equinoctial ring dial

Equinoctial Ring Dial. 18th-century brass equinoctial ring dial by TR, the meridian ring engraved with latitude scale 90-0-90 degrees, reverse with scale for determining solar altitude and zennith distance, equinoctial ring with obverse engraved with hour scale in Roman numerals, central bridge with pin-hole sliding over calender and zodiac scales, 9cm diameter, in original shagreen case

(Qty: 1)