An unusual mahogany stick barometer, Jesse Ramsden, London
circa 1790
circa 1790
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拍品詳情
An unusual mahogany stick barometer, Jesse Ramsden, London
circa 1790
circa 1790
with concealed tube, the glazed engraved ivory scale with vernier and signed Ramsden, London, the mercury thermometer with fahrenheit and temperature compensation scales, the case with swan neck cresting and brass finial, well figured trunk and half-turned cistern with ivory float needle
97cm. 38¼in. high
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97cm. 38¼in. high
相關資料
Jesse Ramesden (1731-1800), was born in Salterhebble, Yorkshire. In 1756 he was apprenticed to Mark Burton a mathematical instrument maker in the Strand, London and initially worked for other makers such as Peter Dollond and George Adams. In 1766 he married Sarah Dollond, sister of Peter and, in 1768, set up his own business in Haymarket. He was an innovative maker and is credited with inventing a dividing engine for the accurate division of scales. He had several apprentices including William Cary, and he employed Matthew Berge who succeeded him on his retirement . He died shorly after retiring in 1800. This barometer is unusual at this date in incorporating ivory scales and the temperature compensation scale to allow for the expansion of mercury.
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