A TWO-DAY MARINE CHRONOMETER WITH HARTNUP BALANCE

Details

A TWO-DAY MARINE CHRONOMETER WITH HARTNUP BALANCE
Hewitt & Son, No. 2554

the silvered dial signed and numbered Hewitt & Son MAKERS TO THE ADMIRALTY, LONDON No. 2554, hour chapter with Roman numerals, outer minute chapter with Arabic five minute internmarkers, gold hour and minute hands, subsidiary seconds dial with blued steel hand, up-and-down dial with gold hand, Earnshaw escapement, Hartnup bimetallic dish-shaped balance, blued steel helical balance spring, spring foot detent with jewelled locking stone, brass bowl, gimballed in three-tier rosewood box with quarter-round brass edging and single stringing, plain inset bone ivory rectangular plaque to centre section, recessed brass drop handles
96mm. dial diam., 183mm. sq. box

Lot Essay

Hewitt & Son are recorded at 10 King Street, Tower Hill, EC....
This chronometer is circa 1860.

No. 2554 was entered in the 1861 Greenwich Annual Trial (placed 33); again in 1863 (placed 48) and in 1867 (place 43). The chronometer was not purchased for the Royal Observatory.

The Trial's Results state:-
Hewitt & Son. 12 John Street, Mildmay Park Kingsland, London
Construction of Escapement and Balance: Hartnup's

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