The mariners compass compleated: or, the expert seaman's best guide. In two parts. Containing ample specimens of the general table of the magnetical variations (or deviations) of the magnetick needle at places, ... By Z. Williams. Part I. - Williams, Zachariah (printed by J. Oliver, for the author; and sold by M. Cooper; J. Clarke; C. Corbet; J. Millan; and J. Booth, 1745)