Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 151
ola. 134 DESCRIPTIVE GEOMETRY [VII, § 121 121. The Ellipse. An ellipse is generated by a point whichmoves so that its distance from a fixed point bears to its dis-tance from a fixed line a constant ratio less than unity. (Seealso § 112.) For typical form and nomenclature for the ellipsesee Fig.… … nf = cv. kf;kl::df:dp::df:dp:: vf:vo < i.= eccentriciti|.. df+df= vf+vf= vv. df and df = focal distances of d. Fig. 130 df/dp are equal to the eccentricity of the curve. Also cf/cvis the same ratio. The ellipse may also be defined as a curve generated by apoint which moves so that the sum of its…
Geometry, Descriptive
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