Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 160
F and F and the vertices v and v. From F and F ascenters, with radii greater than Fv, swing arcs aa and aa. Addto the radius just used an amount equal to m, and swing arcshh and hV from the centers F and F. The intersections cand c are points on the hyperbola. VII, § 130 a] CURVED LINES 143 III.… … Fig. 140 V. A method similar to that of §§ 115,1, and 124,1, may bedevised for drawing an hyperbola by continuous motion. 130 a. Tangent and Normal to the Hyperbola. The tangentto an hyperbola bisects the angle between the focal radii of anypoint. Thus, in Fig. 140, the angle F-pm being made equal…
Geometry, Descriptive
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