PARQUET REGULATOR BY JEAN-AIME JACOB, CIRCA... - Lot 306 - Osenat

Lot 306
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Estimation :
15000 - 20000 EUR
Result with fees
Result : 16 250EUR
PARQUET REGULATOR BY JEAN-AIME JACOB, CIRCA... - Lot 306 - Osenat
PARQUET REGULATOR BY JEAN-AIME JACOB, CIRCA 1825-1830 In solid mahogany with mottled, moiré and burled Cuban mahogany veneer and oak back. Issued from a Jacob's Subscription, it bears the mention ''Régulateur Marchant Une Année'', inscribed in marquetry on the cornice. Clockwork of a very great precision in its execution allowing a Walk of one Year with a remarkable reliability. Usually, the regulators have a power reserve of 1 month. To obtain a reserve of one year, the watchmaker has added an additional wheel in the gearing that gives a multiplication coefficient of twelve. This implies a new design of the mechanism to accommodate a very important weight, a perfect escapement wheel, new techniques in the hardening of steel for the pivots so as to optimize the friction and therefore the regularity and reliability without stopping for a year. Graham anchor escapement. Subscription n°43 engraved on the back plate. Silvered brass dial with Roman numerals. Blued steel hands for hours, minutes and central seconds. Blade suspension. Balance wheel in northern fir with brass weight equipped with support nut and lock nut for the adjustment of the period. Driving force by a 15,5 kg weight in moulded brass with pulley and braided steel cable. On the door: Central mercury barometer with tube and cut glass vase. Silver plated brass graduated plate. Adjustable reference index. To the right of the barometer, alcohol thermometer with two scales (-40 to +97° Centigrade) and (-32 to +78° Réaumur). To the left of the barometer, mercury thermometer with two scales (-27 to +50° Centigrade and -21 to +40° Réaumur). Height : 207 cm 207 cm - Width : 54 cm - Depth : 27 cm. Jean-Aimé Jacob (circa 1825 -1830) Jean-Aimé Jacob was one of the most important French watchmakers of the second half of the 19th century. He specialized in precision clocks. Born in Sisteron, he moved to Paris at a relatively young age and began working in the workshop of Pierre-Louis Berthoud in April 1813. A few months later, after Berthoud's death, his widow asked Jean-François-Henri Motel to continue running the workshop. Jacob stayed with Motel for several years, and in April 1816 joined the workshop of the famous watchmaker Abraham-Louis Breguet. After a remarkable career in Paris during which he won several gold and silver medals at the French Industrial Exhibitions, around 1840 Jacob decided to open a workshop in Saint-Nicolas d'Aliermont, a town considered to be a center of watchmaking excellence. He was quickly recognized for his inventiveness and his well-finished creations. He became famous for his chronometers, chronographs and compensation regulators, having invented several important technical improvements. After receiving the title of Chevalier de la Légion d'Honneur in November 1859, Jean-Aimé Jacob seems to have gradually retired. He died in Dieppe on January 30, 1871.
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