Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 106
Special Case II. Suppose that either the first or the secondgiven line is a profile line. The general solution will apply tothis case ; but if the problem be solved in this manner, a profileprojection will be necessary. A simple construction, by whichthe use of a profile projection may be avoided,… … Fig. 145. auxiliary line E parallel to C. Pass the plane Q through thetwo parallel lines D and E. Then if the required plane is tocontain ab and be parallel to C, plane Q is the required plane.If, however, the required plane is to contain C and be parallelto ab, the plane It, passed through C…
Geometry, Descriptive
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