Universal equinoctial ring dial for all latitudes. Standard dial (see related terms) except for the following details:-

A slider moves in the grooved rim of the meridian ring and has a pointer as a latitude indicator. Two latitude scales adorn opposite quadrants, each divided clockwise [0°]-[90°], while the remainder of the obverse side of the meridian ring is inscribed with a table of latitudes for European places, continued on the reverse. Also on the reverse side is a scale for determining the solar altitude and zenith distance. On the equinoctial ring, there is an hour scale on the obverse side and a further table of latitudes on the reverse. There is a date scale, a declination scale (inscribed 'Declinaison du Soleil' [Solar declination]) and the equinoxes are marked at 21 March and 24 September. Foliate decoration adorns the stops, bridge ends and supports, and the gnomon has indexes to mark the date and declination.

This instrument has two features that are not common on French equinoctial ring dials. First, the suspension piece is attached to a whole ring, which moves in the rim of the meridian ring (a typical aspect of German instruments). Second, it has an altitude quadrant on the reverse side, which is almost exclusively found on English dials of this type. It is signed 'Delure AParis' on the obverse side of the meridian ring. The Delure responsible for this instrument was probably Jean Baptiste Nicolas Delure.

For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.