Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 139
ht line, which is sometimes called an element of the curve. * See the footnote on page 120.119 120 DESCRIPTIVE GEOMETRY [VII, § 106 The direction of this line will give the instantaneous directionof the generating point when it passes along the curve throughthis position. Thus, in Fig. 117, the… … Fio. 117, A curve is sometimes defined as being generated by a pointwhich moves so that three consecutive positions of the generat-ing point do not lie, in general, on a straight line.^ 107. Tangent and Normal. If any element of a curve isejrtended in its own direction, as dj. Fig. 117, the…
Geometry, Descriptive
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