An epicycloid may be traced or generated, as it is termed, by a point in the circumference of a circle that rolls without slip upon the circumference of another circle.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
Cut out a piece of sheet zinc so that its edge will coincide with the curve A and the epicycloid O, trying it with all four of the epicycloids to see that no slip has occurred when marking them; shape a template as shown in Fig.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose