Achille Brocot, 6 rue du Parc Royal, Paris, No. 4866, circa 1865. Very rare and important year going, moon phase astronomical hour and half hour striking dock with perpetual calendar and barometer, demonstrating the long duration system patented by Maurel on 24 November 1858. | Important Collectors Wristwatches Pocket Watches & Clocks | Geneva, Hotel Des Bergues, 22nd April 1995

Important Collectors Wristwatches Po...

Geneva, Hotel Des Bergues, Apr 22, 1995

LOT 137

Achille Brocot, 6 rue du Parc Royal, Paris, No. 4866, circa 1865. Very rare and important year going, moon phase astronomical hour and half hour striking dock with perpetual calendar and barometer, demonstrating the long duration system patented by Maurel on 24 November 1858.

CHF 12,000 - 15,000

USD 10,000 - 12,000

C. Shaped black marble with barometer and perpetual calendar symmetrically disposed below the main dial. D. White enamel with Roman numerals. Blued steel Breguet bands. Subsidiary enamel dial for the metallic barometer, the centre painted with a cloudy sky and for the perpetual calendar with moon phase aperture, days of the week, dates and months with the signs of the Zodiac. M. Brass full plate double train movement, the going and the striking train, both with four pairs of going barrels geared to each other according to the invention of Maurel and visible on the border of the dial. Brocot escapement, half second beating compensated pendulum, invented by Achille Brocot in March 1847, drawn from the Ellicot device, Brocot spring suspension. The perpetual calendar work is driven by the striking train. Signed on the dial, trade mark punched on the movement. In very good condition. Dim. 60 x 58 x 17,5 cm.

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This important dock demonstrates most of the major inventions made by Achille Brocot: his escapement, his supension, his compensated pendulum and the fourth type of his perpetual calendar. It is also a fine demonstration of the long duration mechanism devised by Maurel on 24 November 1858 and described in the Revue Chronométrique, Vol.I1I, pages 171 and 172, plate XXI, fig. 2. The dock is coming with photocopies of the principal patents and of the Maurel description in the Revue Chronométrique.