| 11. | The marine chronometer was invented by John Harrison in 1730.
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| 12. | In the 19th century the town was known for its pocket and marine chronometers.
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| 13. | The book remains the authoritative work on the marine chronometer.
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| 14. | In 1767 he sailed to the Baltic with Charles Messier to test marine chronometers.
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| 15. | These were not as accurate as the boxed marine chronometer but were adequate for many.
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| 16. | This combination of innovations served as the basis of marine chronometers until the electronic era.
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| 17. | The term chronometer is also used to describe a marine chronometer used for celestial navigation.
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| 18. | The marine chronometer is no longer used for navigation.
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| 19. | Quartz crystal marine chronometers have replaced spring-driven chronometers aboard many ships because of their greater accuracy.
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| 20. | Initially, he established a joint business with William to manufacture marine chronometers and optical and nautical instruments.
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