Timekeeping, Chronometers, precision watches and timekeepers

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H4

ZAA0037
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
The Board of Longitude by Richard_Dunn
John Harrison by NMMCollections
Gallery locationNot on display
PeopleProvenance: Royal Greenwich Observatory

Object details:

Object ID ZAA0037
Description Marine timekeeper, H4. This is Harrison's prize-winning longitude watch, completed in 1759. Harrison had been working on improving watches as a sideline to his development of the much larger H3. In 1753 a pocket watch was made to Harrison's design by watchmaker John Jefferys. This went so well that Harrison began to realise that it pointed to the longitude solution - not in H3 but in smaller watches. Work began on H4 in 1755 and, with its very stable, high frequency balance, it proved the successful design. It is shown here at almost actual size. See also; ZAA0034 (H1), ZAA0035 (H2) and ZAA0036 (H3).
Date made 1759

Artist/Maker Harrison, John
Place made London
Credit National Maritime Museum, Greenwich, London
Materials brass; steel; silver; diamond; ruby; enamel; copper; glass
Measurements Diameter: 132 mm;Overall: 165 mm x 124 mm x 28 mm x 1.45 kg
Parts
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