7,475 CHF
“Pocket Chronometer” John Roger Arnold, London, No. 3022, circa 1810. Fine and very interesting silver pocket chronometer with Arnold detent and Arnold’s right-angle compensation. Three-body, "Consular", polished, fixed cuvette. White enamel, radial Roman numerals, outer minute dot divisions, subsidiary seconds. Gold "spade" hands. 47 mm, hinged, gilt full plate, cylindrical pillars, jeweled to the fourth, fusee and chain, maintaining power, Arnold spring detent escapement, plain polished three-arm steel balance, single footed cock with diamond endstone, blued steel flat balance spring, Arnold’s adjustable right-angle compensation curb and index regulator. Dial and movement signed. Diam. 58 mm. Notes It is rare to find an unconverted Arnold escapement; it is even rarer to find one with such unusual compensation. In a regular compensation curb all parts are made fixed and are installed as such; they cannot be adjusted, and they either work correctly or do not. In this watch, the compensation can be adjusted by changing the point at which it acts on the regulator pin: the closer to the center, the greater the compensation, the farther away, the lesser the compensation. It seems that the present compensation was Arnold's answer to Earnshaw's sugar- tong compensation. John Roger Arnold (1769-1843) The son of eminent British horologist John Arnold, he was apprenticed in Paris to A.-L. Breguet in 1792. He was admitted as a member of the Clockmaker's Company in 1796, an
Auctioneer:
Antiquorum
Date:
2005-11-13
