. John Burston's navigation chart: scale bars are of 100 leagues, at 20 leagues to 1degree; that is, on a plane chart like this, 1 league is equal to 3 miles of 5,000 feet each. Mounted on hinged boards. [Navigation chart: the western approaches to the British Isles from the Americas, Africa, and the Mediterranean, 1660]. 1660. Bodleian Libraries, Navigation chart- the western approaches to the British Isles from the Americas, Africa, and the Mediterranean, 1660

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