Instruments · Marine timekeeper (large watch)
Harrison's H4 marine timekeeper
VerifiedEditorial status
Demonstrated on Atlantic voyages (1761–64) that a timekeeper could determine longitude at sea.
- Maker / attribution
- John Harrison
- Attribution as recorded
- John Harrison
- Country of origin
- England
- Place of manufacture
- London
- Date
- Completed 1759
- Historical period
- Precision & Scientific Horology
- Movement
- Verge with diamond pallets, remontoire
- Escapement
- Verge escapement
- Winding / power
- Key-wound, fusee
- Case / materials
- Silver pair case
- Dimensions
- c. 13 cm diameter
- Holding / location
- Royal Museums Greenwich
Mechanisms in this object
- Fusee — Component
- Verge escapement — Escapement
Related reading
- Longitude, Dava Sobel (1995)
- Old Clocks and Watches and Their Makers, F. J. Britten (1899 (first edition))
About this record
Fields marked "Undocumented" have not been verified by our editors and are intentionally left blank rather than estimated. Corrections with sources are welcome.
