polyconic

There are two forms, the simple or equidistant polyconic, and the rectangular polyconic.

For single sheets on large scales there is nothing to choose between this projection and the simple polyconic.

A rectilinear approximation to the simple polyconic is also used for the topographical sheets of the Survey of India.

The rectangular polyconic is occasionally used by the topographical section of the general staff.

The polyconic projection (see fig. 5) is used for most Government maps.