S. L. Pe?ifield — Stereographic Projection. 



13 



and also through the stereographically projected 83° point, 

 as plotted on the diameter x y, by means of the graduation 

 on the base line of protractor No. I. 



7, A and B. 



| \The Stereographic Projection of Great Circles. — What was 

 true of a small circle described about some pointy as a center, 

 holds true also for a great circle intersecting a north and south 

 meridian, figure 7, A, at points a and b, 90° from p. In the 

 special case illustrated by the figure, p being 36° from the 



