Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 94
Fig. 121. the lines is a profile line; thus, the line E, Fig. 121, does notintersect the profile line ab, since the point c, in which E piercesthe profile plane containing ab, does not lie on the line ab. … If the point of intersection is outside the limits of the draw-ing (Fig. 122), the test fails. In this case take any two points,d and e, on A, and any two,/ and g, on B. Then if A and Bintersect, df and eg (or else dg and ef) will intersect. 74 DESCRIPTIVE GEOMETRY [X, § 96 96. A Line in a Plane.…
Geometry, Descriptive
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