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An image showing 'H4 Harrison Marine Timekeeper - Front Face'
An image showing 'Marine timekeeper (H4), obverse'
An image showing 'Marine timekeeper (H4), obverse'
An image showing 'Marine timekeeper (H3), open upper plate'
An image showing 'Marine timekeeper (H4)'
An image showing 'Marine timekeeper'
An image showing 'H4 Harrison Marine Timekeeper - Front Face Out of Case'
An image showing 'H4 Harrison Marine Timekeeper - 3/4 View Showing Depth of Case'
An image showing 'H4 Harrison Marine Timekeeper - Detail of face out of case showing flowers on porcelain'
An image showing 'H4 Harrison Marine Timekeeper - Detail of face out of case on white'
An image showing 'H4 Harrison Marine Timekeeper - Detail of face out of case on black'
An image showing 'H4 Harrison Marine Timekeeper - Internal Movement'
An image showing 'H4 Harrison Marine Timekeeper - Internal Movement'
An image showing 'H4 Harrison Marine Timekeeper - Internal Movement'
An image showing 'H4 Harrison Marine Timekeeper - Detail of Internal Movement'
An image showing 'H4 Harrison Marine Timekeeper - Detail of Inscription "John Harrison and Son A.D 1759"'
An image showing 'H4 Harrison Marine Timekeeper - Detail of Inscription "John Harrison and Son A.D 1759"'
An image showing 'H4 Harrison Marine Timekeeper - Hallmarks on Inner Silver case, "IH" "Lion" "Lion's Head" "C"'
An image showing 'H4 Harrison Marine Timekeeper - Hallmarks on Inner Silver case, focus on Lion (Sterling Mark)'
An image showing 'H4 Harrison Marine Timekeeper - Hallmarks on outer case'
An image showing 'H4 - Internal Movement'
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H4

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).
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Object Details

ID: ZAA0037
Collection: Timekeeping
Type: Marine timekeeper
Display location: Not on display
Creator: Harrison, John
Places: Greenwich
Date made: 1759
Exhibition: Time and Longitude; Ships, Clocks & Stars: The Quest for Longitude
People: Royal Greenwich Observatory
Credit: National Maritime Museum, Greenwich, London
Measurements: Dial diameter: 102 mm;Overall: 165 mm x 124 mm x 28 mm x 1.45 kg
Parts: H4