Giovanni Baptista Ronchetti, Manchester. c.1790.
A rare design of 18th century Georgian stick barometer by Baptista Ronchetti of Manchester.
The mahogany edge moulded case with an early overhanging architectural broken pediment, inlaid decoration and turned cistern cover.
The long mercury filled thermometer is mounted on a well engraved silvered scale with engraved floral decoration, the scale is inset into the main body of the barometer. The main silvered register scale is again very well engraved with floral scrolling decoration and unusual Masonic symbols, the maker's name, 'Baptiste Ronchetti & Co.' engraved across the full width of the plate. The manual vernier marks the level of the mercury on the main tube, which on this barometer is the rare bayonet style tube which allows the main length of the tube to be concealed and by bending it then bringing the top of the tube forwards so that it can be read.
(One of the foremost of barometer makers, Giovanni Baptista Ronchetti, emigrated from Italy to Manchester from Tavernerio, near Lake Como, Italy in 1785. He worked from 15 High Street and was joined by his son and nephew and Dominic Bolongaro who all went their separate ways after a while. He is thought to have died circa 1810).
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