John Poole, Maker to the Admiralty, 57 Fenchurch Street, London, No. 2326, circa 1860. Very fine 56 hour marine chronometer with power reserve indication and Poole's balance. | Important Collectors Wristwatches Pocket Watches & Clocks | Geneva, Hotel Des Bergues, 21st October 1995

Important Collectors Wristwatches Po...

Geneva, Hotel Des Bergues, Oct 21, 1995

LOT 219

John Poole, Maker to the Admiralty, 57 Fenchurch Street, London, No. 2326, circa 1860. Very fine 56 hour marine chronometer with power reserve indication and Poole's balance.

CHF 8,000 - 9,000

C. Three body entirely brass bound rosewood box, with inlaid brass stringing and sunk brass handles, glazed upper section with hinged lid. Brass bowl and gimballed suspension. D. Silvered with Roman numerals, subsidiary seconds and up-and-down scale. Gold " pear" hands. M. Spotted brass full plate, relieved for the barrel, with cylindrical pillars, fusee with chain and maintaining power, Earnshaw type spring detent escapement, Poole's auxiliary compensation balance, diamond endstone, free sprung blued steel helical balance spring with terminal curves. Signed on the dial. In excellent condition. Dial diam. 101 mm. Dim. 19 x 17.5 x 17.5 cm.

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Notes

Poole's Auxiliary compensation balance. Draving by David Penney. Rim is constrained by banking screw in cold. JOHN POOLE 1818-1867 began making chronometers in 1840, quickly establishing himself as one of the leaders in the field. His original form of auxiliary compensation which, the reverse of Molyneux's, works only in the cold and was first used in about 1850. In 1867 he received a gold medal at the Paris exhibition but in the saure year committed suicide, his business being carried on by his brother, James Poole, who had previously worked with him but specialised in watches.He, inturn, was succeeded by his son, J.U. Poole.