23,000 CHF
Precision Timekeeper with 1 ComplicationBarraud, Maker to the Royal Navy, 41. Cornhill, London, No. 2736, circa 1850.Fine and very rare two-day marine chronometer with auxiliary compensation and 56-hour power reserve indicator. Brass bowl with weighting ring and threaded glazed bezel gimbaled in three-body brass-bound mahogany box with glazed panel in the top under hinged lid with fitted catch, flush-fitted brass handles and circular mother-of-pearl plate, Breguet-type key in a corner plate, key-lock in front, gimbal ring locked by two swiveling arms pressing upwards against the base of the cylinder. Notes A very rare chronometer, just a handful of Lund's compensating devices are known to survive. Cedric Jagger, in his book "Paul Philip Barraud. A study of a fine Chronometer Maker", London, 1968, says that he has seen only four specimens (1718, 2326, 2330, 2913), two of which were still in service on oil tankers in 1968.Lund's auxiliary compensation weightsIn 1843 Lund patented a small temperature-sensitive contrivance, which could be fitted to any standard balance in place of regular weights and so eliminate mean temperature error. Lund's weight, working on the principle of bimetallic compensation, induces non-linear expansion to the balance system which in theory cancels the changes of elasticity in the balance spring and so makes compensation perfect. According to Cedric Jagger, in the above mentioned work, all four Barrauds with Lund's weighthat he saw had app Read more…
Auctioneer:
Antiquorum
Date:
2001-11-11
