Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 18
must lie in X. Since the H trace is apoint of the line, its V projection must he in the V projec-tion of the line. If, therefore, the V projection of the lineis extended till it cuts X, this point will be the V projectionof the H trace. A perpendicular to X at this point willcross the H projection… … Fig. 8. 8 DESCRIPTIVE GEOMETRY Note.—^A line is said to cross a given quadrant whenthe portion between the traces lies in that quadrant. Since the projections of points determine the projec-tions of lines containing them, exercises in the projectionof lines must depend in general on Problems 1 and…
Geometry, Descriptive
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