Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 146
y be required. Since n/m is<l, the curve ace is part of an ellipse. If thelong leg of the dividers had been used nextthe focus, the result-ing curve jkl, would have been an hyperbola, with an eccentricity VII, § 114] CURVED LINES 129 equal to mjn. If m is made equal to n, the resulting… … Fig. 125 Since the eccentricity of every parabola is the same the onlychance for variation in this curve lies in varying the distancebetween the focus and directrix. Figure 125 shows the effectof such variation. It will be seen that all have the same char-acter, but are drawn at different scales; Z…
Geometry, Descriptive
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