Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 165
rom the point of tangency beingequal to a proportionate part of the circumference. 148 DESCRIPTIVE GEOMETRY [VII, § 134 Of course this curve may consist of as many turns as maybe desired, the general shape being that of a spiral. The circlefrom which the curve is evolved is called the evoluie.… … FiG. 145 (After Vignola.) struction is completely shown in Fig. 145. It is composed ofmutually tangent circular arcs. The centers for these arcsare located in the order shown on the large scale insert in thefigure, the small circles indicating the centers for the outercurve, while the short cross…
Geometry, Descriptive
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