8,050 CHF
Joseph Sewill, Maker to the Admirality, 61 South Castle St. , Liverpool, No. 4154, circa 1870. Very fine and rare, mahogany, eight day going marine chronometer with power reserve indication. Three body with sunk brass handles (later custom made), glazed upper section with hinged lid. Brass bowl and gimbaled suspen-sion. Silvered with radial Roman numerals, subsidiary seconds and up-and-down scale. Gold “spade” hands. 92 mm, two framespotted brass, cylindrical pillars, fusee with chain and maintaining power, Earnshaw type spring detent escapement, cut bimetallic com-pensationbalance with sliding circular temperature weights and brass mean-time screws, diamond endstone, free-sprung helical steelbalance spring with terminal curves.Dial signed.Dim. 21 x 21 x 22 cm. Notes Joseph Sewill was a maker to the Admiralty and the Royal Navy. He was awarded a Prize Medal at the 1862 International Exhibition. He invented and patented his own auxiliary compensation balance. In 1874 he won the Greenwich Observatory Chronometer Contest. Most of his chronometers are two-day chronometers. He used ebauches by Kullberg, Mercer, Poole, Murray. The present one is by Mercer.
Auctioneer:
Antiquorum
Date:
2004-11-14
