Smart, Edward Howard · London : Macmillian and Co. · leaf 230
ve. (a) Dkk. Two ranges are said tobe in perspective when the joinsof corresponding points are con-current. (/>) Def. Two pencils are said tobe in perspective when the inter-sections of corresponding rays arecoUinear. Distinction between Ranges and Pencils in Perspectiveand Projective Ranges and… … V.- FiG. 103. A succession of projections from different vertices gives arange or pencil which is said to be projectiA^e with the originalrange or pencil. For example, in Fig. 103, the ranges A^B^C^Dj and A2B.,C^Doare in perspective, as also the pencils whose vertices are Vj andV^; but the ranges…
Geometry, Projective
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