Classifications
conic
conformal
Graticule
Meridians: Straight lines, infinite in extent in a full world projection.
Parallels: Arcs of circles subtending 120°.
Poles: North pole is a point; south pole is at an infinite distance.
Similar projections
This projection is a specialization of the spherical Lambert conformal conic projection.
Origin
John F.W. Herschel presented the projection in 1859, apparently oblivious to Lambert’s work.