Y A REGENCY MAHOGANY MERCURY WHEEL BAROMETER WITH TEN-INCH DIALJ. SILVA, PLYMOUTH, CIRCA 1825The 10 inch circular register engraved with rococo scrolls to centre within concentric scale calibrated in barometric inches and with the ual observations within cast brass convex glazed bezel, the ebony and box edged mahogany case with hygrometer to the swan neck pediment over arched Fahrenheit scale spirit tube thermometer to the balter upright, the rounded base with recording hand setting square above glazed spirit level inscribed J. Silva, Plymouth.107cm (42ins) high excluding finial, 31cm (12.25ins) wide.Provenance: The retail stock of Barometer World Meum, Merton Devon.J. Silva of Plymouth does not appear to be recorded in the ual sources however an L. Silva with no location is recorded in Banfield, Edwin BAROMETER MAKERS & RETAILERS 1660-1900 as working circa 1810-30.