Longitude at sea, : not to be found by firing guns, nor by the Most Curious Spring-Clocks or Watches. But the only true method for discovering that valuable secret by the sun, moon or stars, and an Exact Time-Keeper, with such Necessary Improvements, as
Bok Engelsk
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| Utgitt | London : printed for Richard Mount, and Company, on Tower-Hill, and John Morphew, near Stationers-Hall
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