A new and true method to find the longitude, much more exacter than that of latitude by quadrant. [electronic resource] : Also, a New Method for the Latitude, Truer abundantly than that by Meridian; And by Observation of the Sun, never before discover'd; and in a plain and familiar Way, for the Publick Good, by one who has been both Commander and Owner of several Vessels. Proved by experience, And Recommended to publick Consideration, By William Hall, At Mr. John Cruthars, the Sign of the Leg, in Thames-Street, near the Custom-House, London.