Y A GEORGE III MAHOGANY MERCURY WHEEL BAROMETER WITH TWELVE-INCH DIAL G. Ronchetti, Manchester, circa 1800 The 12 inch circular silvered register centred with Prince-of-Wales surmounted rococo scroll engraved cartouche within scale calibrated in barometric inches with the usual observations within cast brass bevel glazed bezel, the ebony and box triple line-edged case with hydrometer to the swan neck pediment over arch glazed silvered Fahrenheit scale spirit thermometer to the baluster-outline upright, the rounded base with recording hand setting key over glazed spirit level signed G. Ronchetti, No. 51, Spear Street, Manchester. 114cm (45ins) high excluding finial. Provenance: The Selwyn Demmy Collection. A G. Ronchetti does not appear to be separately listed by Banfield however his is probably closely associated or related to the well known maker of stick, angle and wheel barometers Baptista Ronchetti who is recorded in Banfield, Edwin BAROMETER MAKERS & RETAILERS 1660-1900 as working from Spear Street Manchester from 1785 and then later at 15 High Street until around 1810. Condition Report: Tube is filled with no obvious airlocks, the float mechanism etc. is intact and operational however will probably require setting-up/calibration. The dial/register is in fine condition with no visible faults and the setting hand mechanism is operational. The thermometer has very slight tarnishing to the silvering otherwise is in fine condition. The case is in clean condition with only minimal bumps, scuffs and faults commensurate with a very easy life. Condition Report Disclaimer