The Longitude at the Eve of the Third...

Geneva, Hotel Des Bergues, Oct 23, 1999

LOT 45

Jarossay & Compagnie à Paris, circa 1850.Very fine and rare, Brazilian rosewood centre-seconds wall regulator with worm-screw gearing, constructed after the patents No. 215 and 216 fromOctober 16, 1844.

CHF 50,000 - 60,000

Sold: CHF 57,500

C. Rectangular, moulded with four fluted and twisted columns, shaped pediment, glazed door and side panels. D. White enamel small eccentric hour and minute chapter ring with Roman numerals, outer Arabic second ring on the bezel's border. Blued steel Breguet hands. M. Brass, with separate twin going barrels wound separately, but geared to drive around a fixed pinion and providing power by means of a large pulley with an endless rope transmitting the drive to the worm-screw gear train, pin-wheel ecapement, with seconds-beating Steel-rod pendulum, with spring suspension. Highly unusual temperature compensation provided by a long steel rod with micrometric adjustment at the lower end and lifting the pendulum suspension by means of a lever.Signed on the dial and on the bridge linking the barrels.Accompanied by copies of the original patent.Dim. 143 x 36 x 19 cm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: * 3
Dial: 3 - 01

Notes

L. A. Jarossay. One of the most inventive clockmakers from the middle of the 19th century. He was especially known for his research into worm-screw sear-trains. He took out a patent in 1844 on the subject and in 1850 on its application to clocks and regulators with the idea of reducing the costs of production.