Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 127
traces on H and V, theprojection must in turn be represented by its projections on Hand V. Thus, in Figs. 179 and 180, the point b (bh, bT) is theprojection of the point a (ah, av) on the plane Q (HQ, VQ). The projections of a straight line may be obtained by pro-jecting any two of its points, and… … Fig. 181. these lines intersect, respectively, the given plane, and connectthese points. Construction (Fig. 181). Let it be required to project theline ab on the plane Q. From a draw the line C (Ch,Cv) per-pendicular to the plane Q (§ 111), and find the point, e, whereC intersects Q (Prob. 13, §…
Geometry, Descriptive
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