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 56
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). … Fig. 25. 81. Again ; when a plane is vertical, that is, perpendicular tothe horizontal plane, all points and lines in it are horizontally pro-jected in its horizontal trace; since the horizontal projections ofpoints and lines are vertically under the points and lines themselves. Likewise, when a…
Perspective · Mechanical drawing
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