Original colour printed process print with major ocean curents in depicted in blue. Published London c.1890 Dimensions of image = 565mm x 460mm Condition = mended tear in mid-right third, two tears on top edge, paper no evidence of age or foxing. Price = AUD$110 is a cylindrical map projection presented by the Belgian geographer and cartographer Gerardus Mercator, in 1569. It became the standard map projection for nautical purposes because of its ability to represent lines of constant course, known as rhumb lines or loxodromes, as straight segments. While the linear scale is constant in all directions around any point, thus preserving the angles and the shapes of small objects, the Mercator projection distorts the size and shape of large objects, as the scale increases from the Equator to the poles, where it becomes infinite.This is why Greenland becomes an issue in many maps. Source.