John Harrison, a self-taught clockmaker, solved the deadly mystery of longitude at sea with his revolutionary marine chronometer—saving lives and reshaping navigation. After decades battling skepticism and a corrupt prize committee, he won a fortune by proving his H4 was the most accurate sea clock ever made. His inventions also include the bimetallic strip and roller bearings, foundational to modern tech. Today, his masterpiece rests at Greenwich, right where the Prime Meridian stands—a line he helped define. Harrison’s legacy? Still ticking in every thermostat, alarm, and machine you use daily.
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