The mariner's jewel [electronic resource] : or, a pocket companion for the ingenious. Containing decimal arithmetick; extraction of the square root; To know the Eurthen, and how to Rig a Ship; With an Easie and Exact Method for all Gunners, Carpenters, and Boatswanes, whereby to know the Expence of their Stores every Month, and what they have Remaining; With Proper Directions for making of Masts and Yards according to Proportion; With a new List of the Royal Navy; A General Pay-Table for all Degrees of Men; An Abstract of Parliament for the Encouragement of Seamen, with Her Majesty's Approbation hereto; A Guide for Pursers and Stewards; The most usual Terms at Sea explain'd, with Directions how to Work a Ship at Sea; And a Compendium of Sea Gunnery; With several other things needful to be understood by all sorts of Sea-Faring Men. By James Love, Mathematician.