A large Thomas Blunt brass universal equinoctial ring dial, English,...

A large Thomas Blunt brass universal equinoctial ring dial, English, circa 1770,
signed T Blunt London, made for use in both hemispheres, hours dived to 2 minutes, latitudes from N - 90 - 0 - 90 - S, bridge divided to one day intervals and Zodiac signs to one degree intervals, the reverse of the dial with a quadrant 0-90 and 90-0 degrees divided to 1/2 degree intervals, large suspension ring and mount sliding over latitude scale with vernier,
12in x 10in x 2/5in (30 1/5cm x 25cm x 1cm)
Provenance:
Hansord, Lincoln, 2014.
Private collection.