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Falck, N D >» 4.1798.
The ready observator; or An infallible method for determining the latitude at sea: by altitudes of the sun ... The whole rendered peculiarly easy for practice, and annexed with a@ compleat and correct sett of all the necessary tables ... By N.D. Falck.
London: Printed for the author and sold by Wells and Grosvenor ,stationers ,N¢1l,in Cornhiil; by the mathematical instrument-makers,and all booksellers in the sea-port-towns in Great
& (See next card) MB