Lepaute à Paris, circa 1770. Rare and very important, mahogany 15 day going, Iongcase regulator with centreseconds and the equation of time with calendar, invented circa 1760 and described in the addendum of the second edition of his Traité d'Horlogerie, Paris 1767, and in Description de plusieurs ouvrages d'Horlogerie, par Lepaute Horloger du Roi, published in 1766 | Important Watches, Wristwatches and Clocks | Geneva, Hotel Des Bergues, 15th October 1994

Important Watches, Wristwatches and C...

Geneva, Hotel Des Bergues, Oct 15, 1994

LOT 84

Lepaute à Paris, circa 1770. Rare and very important, mahogany 15 day going, Iongcase regulator with centreseconds and the equation of time with calendar, invented circa 1760 and described in the addendum of the second edition of his Traité d'Horlogerie, Paris 1767, and in Description de plusieurs ouvrages d'Horlogerie, par Lepaute Horloger du Roi, published in 1766

CHF 90,000 - 120,000

Sold: CHF 91,500

C. With six glazed panels with inlaid brass bordersl. D. White enamel by Dubuisson, with Roman numerals, inner Arabic minute ring and revolving solar time chapter, apertures above "VI" for the annual calendar. Chased gilt brass hands and counterpoised blued-steel centre-seconds hand. M. Endless rope weight driven train with Lepaute pin wheel escapement, seconds beating grid-iron pendulum. Spring blade suspension. Equation cam and annual calendar ring visible below the dial. Signed on the dial. In very good condition. Dim. 195 x 48 x 22 cm.

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Notes

In the addendum of the second edition of his Traité d'Horlogerie, Jean-André Lepaute, devotes four pages to this new construction. The solar time is easy to read and its mechanism, easy to repair and to adjust, but above ail, the principal advantage, specially for precision regulators, resides in the fact the motive force delivered to the escapement is almost not altered by the equation work additional frictions.