Timekeeping, Chronometers, precision watches and timekeepers

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H1

ZAA0034
Timekeeping

Object connections:

Collection Timekeeping, Chronometers, precision watches and timekeepers
ExhibitionsTime and Longitude, Ships, Clocks & Stars: The Quest for Longitude
User collections Harrison by swettengl
Longitude punk'd by hfinch-boyer
The Board of Longitude by Richard_Dunn
John Harrison by NMMCollections
Gallery locationROG (Floor plans)
PeopleProvenance: Royal Greenwich Observatory

Object details:

Object ID ZAA0034
Description Marine timekeeper, H1. This is the first experimental marine timekeeper made by John Harrison in Barrow-on-Humber between 1730 and 1735 as a first step towards solving the longitude problem and winning the great £20,000 prize offered by the British Government. Now known as 'H1', the timekeeper is unaffected by the motion of a ship owing to its two interconnected swinging balances. It compensates for changes in temperature and thanks to extensive anti-friction devices, runs without any lubrication. It was the first relatively successful marine timekeeper of any kind and was the toast of London when Harrison unveiled it in 1735. It is one of the great milestones in clock-making history. See also; ZAA0035 (H2), ZAA0036 (H3) and ZAA0037 (H4).
Date made 1735

Artist/Maker Harrison, John
Place made Barrow-upon-Humber
Credit National Maritime Museum, Greenwich, London
Materials brass; bronze; steel; oak; lignum vitae
Measurements Overall display height: 673 mm
Parts
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