"A conic projection map is created by placing a cone shaped screen on a globe. The resulting projection is more accurate than the cylindrical projection map discussed above. However, the further we travel down the map, the more distorted, and less accurate the map becomes." (link)

Lambert conformal conic
Lambert conformal conic




Albers equal-area conic
Albers equal-area conic


Polyconic



A Polyconic projection of the Earth.
A Polyconic projection of the Earth.


A polyconic projection is a conical map projection. The projection stems from "rolling" a cone tangent to the Earth at all parallels of latitude, instead of a single cone in a normal conic projection. Each parallel is a circular arc of true scale. The scale is also true on the central meridian of the projection. The projection was in common use by many map-making agencies of the United States from its proposal by Ferdinand Rudolph Hassler in 1825 until the middle of the 20th century.