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An unusual Louis Philippe rosewood long duration wall regulator with endless screw gearing

JAROSSAY & CIE, PARIS. CIRCA 1850

Details

An unusual Louis Philippe rosewood long duration wall regulator with endless screw gearing
Jarossay & Cie, Paris. Circa 1850
The replaced case with moulded arched cresting and on stepped moulded plinth, with part-fluted and part spiral-twist columns to each angle, glazed front arched to top and bottom and rear with rectangular glass panel, glazed sides, gilt-brass bezel to 6 in. diameter white enamel dial, outer second's ring with blued steel hand and subsidiary hours/minutes ring with blued steel Breguet hands, signed JAROSSAY & CIE./A PARIS, the movement above with two separately-wound spring barrels, signed again on a brass bridge between them, geared to drive around a fixed pinion and giving power by a large revolving pulley with endless rope transmitting drive to worm-screw gear train, pinwheel escapement positioned behind the dial, with spring-suspended seconds-beating steel rod pendulum with brass bob, unusual temperature compensation provided by a long steel rod to the rear of the case, with micrometric adjustment to its lower end and lifting the pendulum suspension via a lever to its top; the movement and dial secured into the rear glass with brass screws; case key, winding key
55½ in. (141 cm.) high

Provenance

Antiquorum Geneva, The Longitude at the Eve of the Third Millenium, 23 October 1999, lot 45

Special notice

No VAT will be charged on the hammer price, but VAT at 15% will be added to the buyer's premium which is invoiced on a VAT inclusive basis.

Lot Essay

COMPARATIVE LITERATURE:
Derek Roberts, Precision Pendulum Clocks: France, Germany, America and Recent Advancements, West Chester 2004, p.83
Tardy, French Clocks, Part II, Paris 1982, p.344
Philip Whyte advertisement, Antiquarian Horology, Summer 1991, pp.454-455
A Jarossay regulator was sold Sotheby's London, Important Clocks, Watches, Barometers and Mechanical Music, 12 December 2001, lot 73.
A highly inventive clockmaker, Jarossay produced several idiosyncratic clocks. His first patent for worm gearing, eliminating the need for pinions, was taken out in 1844 (with addition in 1846) and another was taken out in 1850 (with addition in 1851). The present regulator differs from other examples in having the spring barrels above the dial.

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