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The description and use of a new astronomical instrument. CSmith, Caleb] fl. 1740.
The description and use of a new astronomical instrument, for taking altitudes of the sun and stars at sea, without an horizon; together with an easy and sure method of observing the eclipses of Jupiter's satellites, or any other phoenome- non of the like kind, on ship-board; in order to determine the difference of meridians at sea. To which are added, tables for computing the times when the eclipses of the first satel- lite of Jupiter happen under the meridian of
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