The Clock That Changed the World (BBC History of the World)
The Longitude Problem - Improving Navigation with the Harrison Clocks
John Harrison's "H1" clock in action
COMITTI - The Navigator Clock
Should we stop the Harrison clock?
Longitude - TV movie 2000
A Detailed Study of H4 - John Harrison's Longitude Timekeeper Reconstruction
Amazingly accurate clock finally recognised after 300 years - Guinness World Records
The First Chronometer. John Harrison & The Clock That Changed the World
Q&A with M. John Harrison
John Harrison's "H2" clock in action
John Harrison's H1 Clock 1735
Peer inside Nostell's John Harrison's clock
The Clock That Saved Thousands: John Harrison’s Forbidden Fight for Longitude
A model of the remontoire action on John Harrisons longitude watch H4
Royal Observatory Greenwich, H-1 John Harrison's first marine chronometer,
John Harrison's fourth timekeeper
The Clockmaker Who Changed the World: John Harrison's Impact on Navigation
What IS Longitude? | Earth Science
Unlocking Longitude: The Legacy of John Harrison's Revolutionary Marine Chronometer
