The Bonne projection is an equal-area projection. True scale is achievable along the central meridian and all parallels. Although it was used in the 1800s and early 1900s, Bonne was replaced by Lambert Azimuthal Equal Area by the mapping company Rand McNally & Co. and Hammond, Inc. See Lambert Azimuthal Equal Area.
Parallels are concentric arcs that are equally spaced.
Central meridian is a linear graticule.
Scale is true along the central meridian and all parallels.
Maps of continents and small areas. There is some distortion.
Source: Snyder and Voxland, 1989