﻿Smithsonian 
  Report, 
  1943. 
  — 
  Harrison 
  and 
  Strausz-Hupe 
  

  

  Plate 
  5 
  

  

  Orthographic 
  Projection. 
  

  

  In 
  this 
  case 
  the 
  center 
  of 
  projection 
  is 
  at 
  infinity, 
  and 
  the 
  projecting 
  lines 
  all 
  fall 
  perpendicular 
  to 
  the 
  plane 
  

   of 
  projection. 
  The 
  oblique 
  case 
  is 
  like 
  a 
  picture 
  of 
  the 
  globe 
  and 
  recommended 
  for 
  its 
  visual 
  qualities. 
  

   Yet 
  the 
  scale 
  is 
  true 
  at 
  the 
  center 
  and 
  along 
  any 
  concentric 
  circle. 
  Distortion 
  increases 
  toward 
  the 
  periph- 
  

   eries 
  

  

  