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Gerardus Mercator, birth name Gheert Cremer was a Flemish geographer and cartographer, best known for the map projection that bears his name.
Gerardus Mercator was the first to use this equiangular cylindrical projection for drawing a navigational chart of the world on 18 sheets (1569). The Mercator projection is remarkable in that it does not distort angles and shapes and only keeps distances at the equator. It is currently used for nautical navigational and aeronautical charts. Although modern historical cartographic research has established that this projection was used as early as 1511, it is only by Mercator that it has become widely used.
Charles-Emile Jacques was a French painter of Pastoralism and engraver who was, with Jean-François Millet, part of the Barbizon School. He first learned to engrave maps when he spent seven years in the French Army.
