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Marine chronometer

Marine chronometer. Movement and dial in a later glazed box with brass frame. Chronometer has circular base with mirror supported by three brass legs. Instrument is brass except for dial plate which is enamelled. Blue steel minute and second hands. Separate small dial for seconds hand. Aperture in dial to show hours, Roman numerals with pointer. Escapement is a jewelled semi-deadbeat verge on John Harrison's plan. Balance is brass and its spring is provided with a massive experiemental form of bimetallic temperature curb.

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Object details

ID:	ZAA0282
Collection:	Timekeeping
Type:	Marine chronometer
Display location:	Not on display
Creator:	Snellen, William
Date made:	circa 1775
Exhibition:	Time and Longitude
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 225 x 225 x 177 mm
Parts:	Marine chronometer Minute hand for marine chronometer (ZAA0282.1) Marine chronometer base (ZAA0282.2) Marine chronometer case (ZAA0282.3) Base for marine chronometer case (ZAA0282.4) Second hand for the marine chronometer (ZAA0282.5) Minute hand for the marine chronometer (ZAA0282.6)