John Harrison's First Sea Clock

John Harrison's first marine timekeeper, 1735. It took self-taught English clockmaker John Harrison (1693-1776) five years to build Harrison Number One or H1, which kept time so precisely that navigators were able to establish their longitude at sea

Restrictions Only for Ireland and United Kingdom

1700s Chronometer Enhance Enhancement Keeper Keeping Longitude Time Keeper Time Keeping Time-keeper Time-keeping Timekeeper Timekeeping

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