Harrison H4 Marine...
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PeterPan
Interested in JM Barrie and other children’s writers
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TECHNOLOGY
Horology Harrison H4 Marine Chronometer
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John Harrison's H4 marine chronometer revolutionized sea navigation by solving longitude calculation
3 Feb 2026
What was the primary innovation of the Harrison H4 that made it suitable for use at sea compared to earlier timekeeping devices?

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