Marshall Rare Books
A FINE BRASS UNIVERSAL EQUINOCTIAL RING DIAL
English, third quarter of the 18th century, signed "G Adams London," the meridian ring engraved with latitude scale 90-0-90 degrees, reverse with scale for determining solar altitude and zennith distance, equinocitial ring with obverse engraved with hour scale in Roman numerals, central bridge with pin-hole sliding over calendar and zodiac scales, 100 mm diam.
English, third quarter of the 18th century, signed “G Adams London,” the meridian ring engraved with latitude scale 90-0-90 degrees, reverse with scale for determining solar altitude and zennith distance, equinocitial ring with obverse engraved with hour scale in Roman numerals, central bridge with pin-hole sliding over calendar and zodiac scales, 100 mm diam.
George Adams was apprenticed to James Parker in 1724 and turned over to Thomas Heath in 1726, he was freed as a member of the Grocer’s company in 1733 and the following year he was working in Fleet Street, London. His appointments include: Royal appointment to the Prince of Wales and George III, mathematical instruments maker to the Office of Ordnance and supplier of instruments to Christ’s Hospital. Two of his sons were also mathematical instrument makers.