Navigation improv'd [Microform] : 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 Nicolas Facio Duillier
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