Navigation improv'd
Subtitle: being chiefly the method for finding the latitude at sea as well as by land, by taking any proper altitudes, together with the time between the observations : the whole made easy by a new trigonometrical rule : and the means how to refresh the air in the hold of a ship or of a Man of War, and how to measure the number of waves that pass under a ship during any given time in order to make a truer estimation of the ship's way and to have likewise thereby a sort of time-keeper
By: by Nicolas Facio Duillier
Publisher: [s.n.]
Published: 1728
Place of publication: London
Language: eng
Number of pages: 12
Subjects: Latitude; Early works to 1800; Navigation
Notes: Decorated initials.

Boston Public Library (Rare Books Department) copy with note in Fatio's hand on the verso of the titlepage: "London June the 5th 1728.  I shall be further willing, upon proper Encouragement, to go to Sea a short Voyage to demonstrate and teach the Method which I do here propose; As, for instance, a voyage to Gottenburg, Copenhagen, or Portugal. N. Facio."

Boston Public Library (Rare Books Department) copy disbound.