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Illustration showing an ellipse formed by the intersection of the surface of a cone with a plane neither parallel nor perpendicular to a straight line of the surface of the cone nor the axis.


Frederick Converse Beach Encyclopedia Americana (New York, NY: Americana Company, 1903)


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1429×2400, 191.6 KiB

Large GIF

609×1024, 23.2 KiB

Medium GIF

381×640, 13.4 KiB

Small GIF

190×320, 6.0 KiB