Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 53
d line, HQ and VQ are alsoparallel to the ground line ; and conversely. 5. If Q is perpendicular to H, VQ is perpendicular to theground line ; if Q is perpendicular to V, HQ is perpendicularto the ground line ; and conversely in each case. 6. If Q is perpendicular to both H and V, that is,… … VR & Fig. 63 (repeated). planes is an important one to visualize. If Q is perpendicularto H, then the //-projection of every point in Q must fall inHQ, which thus becomes an actual projection of the plane. Thetrace HQ is, in fact, an edge view of the plane Q (Fig. 63). Itshould be noted that a…
Geometry, Descriptive
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