Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 147
ce between focus and directrix. 128 DESCRIPTIVE GEOMETRY [VII, § 113 113. General Construction for Any Conic. In Fig. 124, letthe focus /, and directrix OY, 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 the… … Fig; 1?4 With the short leg at this setting strike an arc from / as a center,cutting hs at c. The point c is one point on jthe 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,…
Geometry, Descriptive
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
