"A common modification was devised [fromLambert
azimuthal equal area] by ernst Hammer in
1892 and is called the Hammer or Hammer- Aitoff projection.It
consists of halving the vertical coordinates of the equatorial
aspect of one hemisphere and doubling the values of the meridians
from center. It retains equality of area, but it is no longer
azimuthal" [Snyder
1987, p. 182]
