Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 145
tance between focus and directrix. 128 DESCRIPTIVE GEOMETRY [VII, § 113 113. General Construction for Any Conic. In Fig. 124, letthe focus /, and directrix 0 Y, be given, and let it be requiredto construct a conic having an eccentricity equal to n/m (ex-pressed at scale by the lines n and m). Set… … Fig. 124 With the short leg at this setting strike an arc from / as a center,cutting bs at c. The point c is one point on the required curve.Another line, dh, yields another point, e. There are of coursecorresponding points below the axis. As many points as areneeded may be found in this manner, so…
Geometry, Descriptive
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