An act for the repeal of all former acts concerning the longitude at sea, except so much thereof as relates to the appointment and authority of the commissioners thereby constituted, and also such clauses as relate to the constructing, printing, publishing, vending, and licensing, of nautical almanacks, and other useful tables : and for the more effectual encouragement and reward of such person and persons as shall discover a method for finding the same, or shall make useful discoveries in navigation; and for the better making experiments relating thereto.