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Lot 116TP,Y
A very rare mid 19th century rosewood patent 'Standard Syphon' barometer with movable scales Bursill & Co., Makers and Patentees, River Lane, Islington, London
11 December 2019, 14:00 GMT
London, New Bond StreetSold for £1,530 inc. premium
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A very rare mid 19th century rosewood patent 'Standard Syphon' barometer with movable scales
Bursill & Co., Makers and Patentees, River Lane, Islington, London
the moulded cornice over a pair of ivory scales, to the left a mercury Fahrenheit and Reamur thermometer, to the right a moveable barometric scale reading from 25 to 31 inches with rack and pinion vernier and seven weather predictions, the trunk set to the centre with a brass knob set in an engraved silvered housing bearing the full signature, activating the rack and pinion mechanism to raise or lower the 25-31 inch scale along the length of the trunk, with a punched scale in inches from 1-24 and a counter pointer moving in tandem against the level of mercury in the U-shaped tube below, the trunk further set with an applied ivory plaque reading 'MACHINA / AD GRAVITATEM / INCUMBENTIS AERIS METIENDUM / A: BURSILLIO' (Machine to measure the gravity of the incumbent air) 1m (3ft 3ins) high
the moulded cornice over a pair of ivory scales, to the left a mercury Fahrenheit and Reamur thermometer, to the right a moveable barometric scale reading from 25 to 31 inches with rack and pinion vernier and seven weather predictions, the trunk set to the centre with a brass knob set in an engraved silvered housing bearing the full signature, activating the rack and pinion mechanism to raise or lower the 25-31 inch scale along the length of the trunk, with a punched scale in inches from 1-24 and a counter pointer moving in tandem against the level of mercury in the U-shaped tube below, the trunk further set with an applied ivory plaque reading 'MACHINA / AD GRAVITATEM / INCUMBENTIS AERIS METIENDUM / A: BURSILLIO' (Machine to measure the gravity of the incumbent air) 1m (3ft 3ins) high
