6,555 CHF
Barraud, unnumbered, London, circa 1800. Fine and rare mahogany two-day marine \ chronometer. rass bowl with glazed bezel secured by two screws, gimbaled in three-body mahogany box with glazed top secured by hinged lid, brass handles. Silvered, eccentric with radial Roman numerals, outer minute ring with five-minute Arabic markers, subsidiary seconds. Blued steel "spade" hands. 100 mm., brass full plate, column pinned pillars, fusee and chain with maintaining power and with motor barrel, Arnold spring-detent escapement, large Arnold Z-type bimetallic compensation balance with bietallic segments terminating with a threaded post for a temperature adjustment round nut, blued-steel free sprung helical balance spring with outer terminal curves, diamond endstone.Signed on the dial and box, numbered on dial, movement and box.Bowl 78 mm. in diameter, box 145 x 140 mm. Notes Chronometers with Arnold spring detent escapement are rare. This one employs an unusually large Arnold Z type balance and also a very unusual mainspring/fusee arrangement. Makers almost always used a going barrel with fusee. In this case, Barraud employed a motor barrel - an arrangement in which the mainspring cover is fixed and thus the position of the mainspring hook is stationary. This arrangement allows for less wear on points of the barrel arbor. The clock also has an unusually large motin train.
Auctioneer:
Antiquorum
Date:
2003-04-12
