Motion of Open Curves
“Since these curves are not closed, one pair cannot be used for continuous motion; but a pair of such curves may be well adapted to sectional wheels requiring a varying angular velocity.” This figure shows an example of the process.
Keywordsplane, spiral, rotation, motion, Translation, surfaces, rolling surface, motions, logarithmic spirals, rolling spirals, open curves
Peter Schwamb, S.B. And Allyne L. Merrill, S.B. Elements of Mechanism (New York, NY: John Wiley & Sons, Inc., 1904)