Classifications
pseudocylindric
equal-area
Graticule
Meridians: Central meridian is a straight line half as long as the equator. Other meridians are equally spaced portions of hyperbolas concave toward the central meridian.
Parallels: Unequally spaced straight parallel lines. Perpendicular to the central meridian.
Poles: Points.
Symmetry: About the central meridian or the equator.
Scale
Correct along 29°42′N/S parallels. Constant along any given latitude; same for the latitude of opposite sign.
Distortion
Free of distortion only at 29°42′N/S on central meridian. Distortion is very low along equator and the central meridian and increasing away from those regions.
Similar projections
Similar to sinusoidal, Craster parabolic, many others, but uses portions of hyperbolic curves.
Origin
Presented by Reinholds V. Putniṇš, 1934.