Rolling of Equal Hyperbolas Small 314×320 Medium 628×640 Large 1004×1024 Download Tiff Original 2400×2447 | (416.4 KB) Description Illustration of the rolling of equal hyperbolas. If two equal hyperbolas are placed so that the distances between their foci O1 and O2, and d and e, are each equal to fg=hk, they will make contact at some point c. Keywords motion, motions, parabola, plane, rolling surface, rotation, surfaces, Translation Galleries Conic Sections: Hyperbolas Source: Peter Schwamb, S.B. And Allyne L. Merrill, S.B. Elements of Mechanism (New York, NY: John Wiley & Sons, Inc., 1904)