A WILLIAM MAHOGANY MERCURY WHEEL BAROMETER WITH TWELVE-INCH DIAL J. Ronchetti, Manchester, circa 1830 The 12 inch circular silvered star-centred register calibrated in barometric inches with the usual observations within cast brass convex glazed bezel, the finely figured case with hydrometer to the rounded pediment over arch glazed silvered Fahrenheit scale mercury thermometer to the baluster-outline upright, the rounded base with recording hand setting key over glazed spirit level signed J. Ronchetti, 43 Market Street, Manchester. 113cm (44.5ins) high. Provenance: The Selwyn Demmy Collection. The current lot is probably by either Joshua or John B. Ronchetti who are recorded in Banfield, Edwin BAROMETER MAKERS & RETAILERS 1660-1900 as brothers working initially alongside their father, Charles Joshua Ronchetti, then in partnership from 1830-52. They initially worked from 4 Cateaton Street from 1830 before relocating to 43 Market Street until 1852 when Joseph Casartelli took over the business. Condition Report: Tube is filled with no obvious airlocks, the float mechanism etc. is intact and operational however will require setting-up/calibration. The dial/register is in fine condition; the setting hand mechanism is operational. The thermometer is in fine condition. The case is in fine clean condition with faults limited to slight bubbling to the edge veneers to the upper right of the dial and minor fading. Condition Report Disclaimer