Precision, Measurement & Control
Harrison H4 timekeeper
John Harrison's H4 used a compact watch-like movement to tackle the problem of accurate timekeeping at sea. Its successful trials helped demonstrate that a portable timekeeper could support longitude determination.
About this artifact
John Harrison's H4 used a compact watch-like movement to tackle the problem of accurate timekeeping at sea. Its successful trials helped demonstrate that a portable timekeeper could support longitude determination.
Sources & image credits
Historical photograph, illustration or documented physical example; the source caption identifies the depicted object.
Image: H4 low 250.jpg
Creator: Phantom Photographer
License: CC BY-SA 3.0
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