Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 140
e. Space curves (Fig. 120) have plane curves for their projections.No matter how a space curve may be turned, the projecting See footnote, page 120. 2 In certain special cases plane curves may be generated in this manner. ^ The word cylinder is here used in the general sense as explained in § 145.… … show the true shapeof the curve. Thetrue form of such acurve can beonly by visualizingit from its projec-tions, or by buildinga three-dimensionalmodel. Fig. 120 124 DESCRIPTIVE GEOMETRY [VII, § 109 Let the student prove that if any two curves are drawn onH and V, at equal distances from P, these…
Geometry, Descriptive
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