Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 102
Case I. Let us suppose that one of the given linesis parallel to H or V. Let A, Fig. 137, be parallel to V. ThenVQ is parallel toi (§ 102), and passes through the F-trace ofthe line B. The trace HQ is determined, as in the generalcase, by the if-traces of the given lines. In Eig. 137, thepoint in… … Ha Fia. 138. Ah a. r uf N Bh * \ \ A l /1 i / ur J/. B a.> i 7U1 VQ AFig. 139. both HQ and VQ are parallel to the ground line (§ 102), onepoint on each trace being located by the line B. Special Case III. Suppose both given lines parallel to theground line. Let A and B, Fig. 139, be the given…
Geometry, Descriptive
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