S. L. Penfield — Stereogram hie Projection. 



127 



Strictly speaking, figure 24 is not a projection, for it does not 

 correspond point for point with the surface of a sphere, accord- 

 ing to some fixed law of projection. It is simply an arbitrary 

 distribution of a series of curves. The only excuse for its con- 

 tinued use in map construction is that, having the distances on 

 the equator and central meridian equally spaced, land and water 

 areas are more uniformly distributed than in the stereographic 



projection. In order to show still another defect of the globu- 

 lar representation, two circular arcs, x and y, have been drawn 

 on figure 24, one running from 40° N". on the periphery to 60° 

 W. on the equator, the other from 60° N". to 60° W. Circular 

 arcs drawn from the same locations on plate III would represent 

 stereographically projected great circles, agreeing in their inter- 

 sections with the meridians and parallels point for point with 

 corresponding great circles drawn on a sphere. Not so with 

 the globular representation, however. The two great circles 

 under consideration, if accurately plotted on the globular chart 

 from their actual intersections with the meridians and parallels, 



