A class of map projections in which the parallels are represented by a system of non-concentric circular arcs with centers lying on the straight line representing the central meridian (Lee 1944). The term was first applied by Hunt, and later extended by Tissot (1881).
Beaman, W. M. Topographic Mapping. Washington, DC: U. S. Geol. Survey Bull. 788-E, p. 167, 1928.Birdseye,
C. H. Formulas and Tables for the Construction of Polyconic Projections.
U. S. Geological Survey, Bulletin 809, 1929.Hunt. Appendix
39 in Report for the U.S. Coast and Geodetic Survey. 1853.Lee,
L. P. "The Nomenclature and Classification of Map Projections." Empire
Survey Rev.7, 190-200, 1944.Snyder, J. P. Map
Projections--A Working Manual. U. S. Geological Survey Professional
Paper 1395. Washington, DC: U. S. Government Printing Office, pp. 124-137,
1987.Tissot, A. Mémoir sur la représentation des surfaces
et les projections des cartes géographiques. Paris: Gauthier-Villars,
1881.