Classifications
pseudocylindric
equal-area
Graticule
Meridians: Central meridian is a straight line 40.5% as long as the equator. Meridians are equally spaced semiellipses intersecting at the poles and concave toward the central meridian.
Parallels: Unequally spaced straight parallel lines, farthest apart near the equator; spacing changes gradually. Perpendicular to the central meridian.
Poles: Points.
Symmetry: About the central meridian and the equator.
Scale
True along the equator.
Constant along any given latitude; same for the latitude of opposite sign.
Distortion
Distortion increases away from the equator.
Similar projections
This is a simple scaling of the Mollweide projection.
Origin
Discussed by Robert H. Bromley in 1965.