Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 96
ion through s*, and then drawingVQ through tv and the point in which HQ intersects theground line. Conversely, VQ may be drawn first, in any direc-tion through f, and then HQ may be drawn through sh andthe intersection of VQ with the ground line. An indefinite number of planes may be passed through… … Fig. 125. 99. Principal Lines of a Plane. For every plane there aretwo systems of lines which are of importance, and are calledthe principal lines of the plane. One of these systems isparallel to II, the other parallel to F. The horizontal principal lines are //-parallels, cut from thegiven plane…
Geometry, Descriptive
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