Elementary linear perspective of form and shadow ... Complete in itself ... For draftsmen, artists, and industrial drawing courses in preparatory and high schools, etc. In two parts.. (1891)
Warren, S. Edward (Samuel Edward), 1831-1909 · New York, J. Wiley & sons · leaf 55
t Avhere either trace meets the ground line iawhere the plane cuts the ground line; hence hoth traces of a planemust meet the ground line at thesame pointy if they meet it at all.The traces of a plane will meetthe ground line unless the planeis parallel to that line. 79. If, as ill Fig. 24, a plane… … Fig. 24. 46 LINEAR PERSPECTIVE. plane of projection, its horizontal trace, HT, will be perpendicularto the ground line, G L. If a plane is perpendicular to both of the planes of projection,both of its traces will be perpendicular to the ground line, as wehave seen in (72-74).
Perspective · Mechanical drawing
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