John Harrison — the genius who made the marine chronometer possible

The Longitude Prize and the Harrison Chronometer

Reconstruction Of The John Harrison H4, The World’s First Precision Marine Chronometer, By Derek Pratt And Roger Stevenson/Frodsham - Quill & Pad

The Harrison Timekeepers H1, H2, H3 and H4 – Redfern Animation

John Harrison’s ‘Clock B’ sets a world record over 250 years after it was designed

The Clock That Changed the World: How John Harrison’s Portable Clock Revolutionized Sea Navigation in the 18th Century

Burgess Clock B, The World's Most Precise Pendulum Clock, Is Made To A 250-Year-Old Design By John Harrison, Longitude Prize Winner And Inventor Of The Marine Chronometer - Quill & Pad

Longitude