(m∂r kā’ t∂r) A conformal cylindrical map projection (q.v.) developed on a cylinder tangent along the equator with the expansion of the meridians equal to that of the parallels. See Figure M-4. The transverse Mercator is a projection onto a cylinder at right angles to the Earth’s axis. Named for Gerhardus Mercator (1512–1594), Flemish mathematician.