LOT 19 A French aneroid ‘Holosteric’ barometer with thermometer, Retailed by Ducatillon, Paris, circa 1860
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A French aneroid ‘Holosteric’ barometer with thermometer Retailed by Ducatillon, Paris, circa 1860 The 4.75 inch circular silvered register with open centre revealing the aneroid mechanism with arched upper scale calibrated in millimetres and with weather observations in French to outer track, inscribed BAROMETRE, HOLOSTERIQUE incorporating HPBN circular trademark for Naudet, Hulot et Cie, the lower section with curved mercury tube THERMOMETRE CENTIGRADE and inscribed DUCATILLON OPT’N 29. B’D DES CAPUCINES PARIS to lower edge, set behind circular glass fitted with a brass recording pointer into a moulded brass case with repeat trade stamp to rear and suspension ring to top, diameter 13.5cm (5.125ins); with an ebonised and faux marble cradle stand, (some damage) 21.5cm (8.5ins) high including the barometer. Naudet Hulot et Cie capitalised on the expiration of Vidie’s patent rights for the aneroid barometer in 1859 by putting into production their ‘Holisterique’ (solid) barometer of which several thousand were made up until 1866.
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Donnington Priory Newbury Berkshire RG14 2JE United Kingdom
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