The oldest and most straightforward of the Conic projections. It is also known as the Simple Conic or Conic and has been in use since Ptolemy developed it sometime around 150 A.D. The parallels are arcs of evenly spaced, concentric circles. The meridians cut across the parallels at right angles. Suitable for maps which extend east/west rather than north/south. It is still the projection of choice for many smaller nations.
This projection is also known as the Simple Conic Projection.