Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 147
he quickest solution. Systematic work becomes increasinglyimportant as the problems become more complex. 130 DESCRIPTIVE GEOMETRY [VII, § 114 It will be evident that as the focus approaches the directrix,the curve approaches the axis; while as the focus recedes, thecurve also recedes, approaching a… … Thread, eaual inlength to ab. Vertey. rocus I ^Axis
Geometry, Descriptive
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