A treatise on practical navigation and seamanship, [electronic resource] : with Remarks, Observations, and Directions for managing and conducting a Ship in all kinds of Weather, either under Sail or at Anchor, with many useful Hints and Remarks by way of Improvement to Navigation and to Navigators, in every Occurrence that can happen to a Ship at Sea or at Anchor. And also, A full and clear Description of the English Channel, with distinct and clear Directions for sailing down the Channel from the Downs westward; also particular Directions for a Ship coming from the Ocean, and entering the English Channel, with Directions for sailing up the same to the Downs, both in fair and foul Weather, with whatever is necessary for the Seaman to know by way of Improvement. To make ships, and the management of them, and also navigation in general more perfect, and Consequently less dangerous and destructive to Men's Lives and Property: together With the Method the Author advised, and which was adopted in Scenes of the greatest Distress at Sea, in a violent Storm. By William Nichelson, Author of his Voyage to the East-Indies, in His Majesty's Ship Elizabeth, Published in the Year 1765. To which is added, an appendix, Containing Remarks on various Subjects, and on the particular Situation of the Centre of Gravity in a Ship, &c. &c.