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Key terms: harrison clock longitude hms marine chronometer watch john harrison accurate gould voyage clockmakers maritime tuning noon maskelyne greenwich marine chronometer pendulum longcase meridian navigation george graham lunar distances board of longitude worshipful company of clockmakers bearing astronomer royal newton regulator no frisius yorkshire genius orford barrow huygens observations nevil guildhall grasshopper escapement once again sobel s chronometer horology timekeepers wooden demanded national maritime museum over time plaque Search external links cited by footnotes on Wikipedia page John Harrison: |
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