An oxidised brass universal equinoctial compass dial, engraved on the hour ring W.& S. JONES 30 HOLBORN LONDON, the hour scale divided IIII-IIX-VIII (x2), with spring loaded gnomon, the latitude arc engraved 10°-80°, the silvered compass dial with engraved compass rose, with edge-bar needle on pivot with clamp, the base plate with level and cross bubble, on three screw feet, mid 19th Century - 5 3/8in.wide