This eight-day marine chronometer has a standard, double-frame reverse-fusee movement with an Earnshaw-type spring detent escapement and a standard compensation balance. The chronometer was purchased by the Admiralty in March 1857, when it was probably about twenty years old, and was sent immediately to William Cribb to be re-rated to solar time from sidereal, and to be “fitted with boxes”. It was then issued to the paddle wheel steamer HMS Cyclops for work taking soundings for laying first Atlantic telegraph cable, returning via HMS Racer in 1862. It was then sent to the fifth rate Flora in 1868, and in 1878 to HMS Terror, the base ship at Bermuda. In 1905 it was issued for service with the Labrador Boundary Commission, used during the Newfoundland Survey. In 1913 it went to the survey vessel HMS Mutine returning from Bermuda in 1915. In 1929 the chronometer was issued to the Royal Society’s Eclipse Expedition to Sumatra, after which it remained at the Royal Observatory for internal use. It was transferred to the NMM collections on the closure of the Royal Greenwich Observatory in 1998.