John Harrison: How His Chronometer Saved the Lives of Sailors
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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
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The Longitude Prize and the Harrison Chronometer
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John Harrison — the genius who made the marine chronometer possible
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John Harrison and The Invention of the Chronometer by @onlineclock
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Reconstruction Of The John Harrison H4, The World’s First Precision Marine Chronometer, By Derek Pratt And Roger Stevenson/Frodsham - Quill & Pad
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John Harrison's marine timekeepers
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