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 31
e which is perpendicular to the vertical plane, and hence thepoint c is its vertical projection. That is, when a line is perpen-dicular to either plane of projection, its projection on that plane iaa point. 49. Continuing to examine this figure, 4, with reference, now, toits lines only, it appears… … Fig. 5. equal to CF. That is, when a line is parallel to the ground line^each of its projections is parallel to the ground line, and equal to the line. 50. Again : AC, for example, is oblique to both planeo of pro-jection, but it is in a plane Aawc, which is perpendicular to both ofthese planes,…
Perspective · Mechanical drawing
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