Let it be supposed that two wheels of equal diameter have contact at their perimeters so that one drives the other by friction without any slip, then the velocity of a point on the perimeter of one will equal that of a point on the other.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
In the middle is a slot and through the body pass the pins A, being so located that their perimeters just press the rod or wire when it is straight, and in line with the axis of the bore through the head, each successive pin A touching an opposite side of the wire or rod.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
It is obvious, however, that when the perimeters of A B meet the shoulders O O, Fig.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose