Clockmaker
John Harrison
Self-taught carpenter and clockmaker who built the first practical marine timekeepers.
Harrison built wooden regulators before devoting decades to the longitude problem. His H1–H3 sea clocks led to H4, a large watch tested on voyages to Jamaica (1761–62) and Barbados (1764).
- Country
- England
- City
- Barrow upon Humber / London
- Founded / active
- Active c. 1713–1776
- Status
- Historical individual
- Key people
- John Harrison, William Harrison
Innovations
- Gridiron pendulum
- Grasshopper escapement
- Bimetallic strip
- Caged roller bearing
