A French brass cased Bourdon pattern aneroid barometer . Bourdon and Richard, circa 1860 he 4.75 inch circular open-centred paper register calibrated in millimetres and annotated in French, signed BOURDON ET RICHARD BREVETES PARIS and with 1849 Paris Exhibition Gold Medal and 1851 Great Exhibition roundels, the centre revealing horseshoe shaped vacuum chamber and rack and pinion linkages, the glass with brass setting pointer, in cylindrical case with brass suspension loop, 13cm diameter, on a foliate carved walnut stand, with a silver-mounted aneroid barometer with milk glass register and engine-turned silver ogee shaped surround indistinctly marked, 15cm diameter.
A French brass cased Bourdon pattern aneroid barometer . Bourdon and Richard, circa 1860 he 4.75 inch circular open-centred paper register calibrated in millimetres and annotated in French, signed BOURDON ET RICHARD BREVETES PARIS and with 1849 Paris Exhibition Gold Medal and 1851 Great Exhibition roundels, the centre revealing horseshoe shaped vacuum chamber and rack and pinion linkages, the glass with brass setting pointer, in cylindrical case with brass suspension loop, 13cm diameter, on a foliate carved walnut stand, with a silver-mounted aneroid barometer with milk glass register and engine-turned silver ogee shaped surround indistinctly marked, 15cm diameter.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
