Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 148
may be required Since n/m is<l, the curve ace is part of an ellipse. If thelong leg of the dividers had been used next the focus, the result-ing curve jW, would have been an hyperbola, with an eccentricity VII, § 114] CURVED LINES 129 equal to m/m. If m is made equal to n, the resulting… … PiQ. 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;…
Geometry, Descriptive
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