John Harrison — the genius who made the marine chronometer possible

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

John Harrison and The Invention of the Chronometer by @onlineclock

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

The Longitude Prize and the Harrison Chronometer

Longitude Prize on Antimicrobial Resistance (AMR) | Challenge Works