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polyconic

polyconic


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Polyconic  \Pol`y*con"ic\,  a.  [Poly-  +  conic.] 
  Pertaining  to  or  based  upon  many  cones. 
 
  {Polyconic  projection}  (Map  Making),  a  projection  of  the 
  earth's  surface,  or  any  portion  thereof,  by  which  each 
  narrow  zone  is  projected  upon  a  conical  surface  that 
  touches  the  sphere  along  this  zone,  the  conical  surface 
  being  then  unrolled.  This  projection  differs  from  conic 
  projection  in  that  latter  assumes  but  one  cone  for  the 
  whole  map.  Polyconic  projection  is  that  in  use  in  the 
  United  States  coast  and  geodetic  survey.