Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 145
126 DESCRIPTIVE GEOMETRY [VII, § 111 II. Space Cubve. Any space curve may be developed intoa plane curve by making it the directrix of a cone orcylinder/ the surface of which is then developed, along withthe given curve, as explained in § 157 and as illustrated in … J. j^d e ^ \1L \ W c* if ^ \ Z o b .c .d e (3)Fio. 122 Fig. 122. The plane curve thus determined may then berectified to a straight line, as shown in Fig. 122, 3, if desired. 112. The Conic Sections. Curves of the group known as theconic sections occur frequently in optics, acoustics, mcchanicStand…
Geometry, Descriptive
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