Chat with John Harrison
The Longitude Prize Horologist
About John Harrison
In 1761, aboard HMS Deptford bound for Jamaica, a walnut-boxed timekeeper—no larger than a carriage clock—survived 81 days at sea and erred by just five seconds. That was the culmination of forty years’ obsession: not with grand theories, but with brass, steel, and the punishing physics of salt air, rolling decks, and temperature swings. While astronomers chased lunar distances from observatories, this man built marine chronometers in a workshop above his father’s carpentry shop in Barrow-upon-Humber—each iteration a quiet rebellion against the Royal Navy’s assumption that longitude was unsolvable by mechanics. He refused the £20,000 Longitude Prize until Parliament granted it in 1773—not because he doubted his work, but because the Board had demanded impossible public demonstrations while ignoring his instruments’ proven accuracy on actual voyages. His clocks didn’t just measure time; they anchored navigation to human craftsmanship, not celestial guesswork.
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Not sure where to begin? Try asking John Harrison:
- “How did you keep your H4 chronometer stable during violent Atlantic storms?”
- “What made you distrust pendulums so completely for sea use?”
- “Why did you insist on using diamond pallets instead of ruby in H4?”
- “Did you ever meet Nevil Maskelyne—and what did you think of his lunar method?”
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