Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 151
y. 134 ANALYTICAL GEOMETRY (3) When x = oo, ?/ = go, .-. curve is open, extending to the rightwithout limit. Note 1. —Equation of directrix is ic + a = 0.Note 2. — TP = EO + OR = x + a.Query. — What curves are these ? a;2 = 4 ay,2/2 = - 4 ax, X- = — i ay. 98. Construction of parabola, focus and… … Fig. 107. Fig. 108. any point K of EF (produced if necessary) erect the ± LL.Now with F as center and EK as radius, cut this ± in Q andE. These are two points on the curve. For FQ = EK = CQ.In this manner any number of points may be found and joinedby a continuous curve. (2) Mechanically. Place a…
Geometry, Analytic
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