Longitude demonstrated, : by the use of a silent pendulum; that keeps true time at sea. And made plain (by an Index Instrument) to the meanest Capacity. With a new observatory for finding the meridian altitude of sun or stars, and a great Improvement of
Bok Engelsk
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| Utgitt | London : printed for W. Graves, at the Black-Spread-Eagle in Pater-Noster-Row; and sold by J. Graves, at the Bible in St. James's-Street, and J. Holland, at the Bible and Globe in St. Paul's Church-Yard
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