That the angular velocities of a pair of turning pieces in rolling contact must be inversely as the perpendicular distances of any pair of points of contact from the respective axes.
That the linear velocity of a shifting piece in rolling contact with a turning piece is equal to the product of the angular velocity of the turning piece by the perpendicular distance from its axis to a pair of points of contact.
Turning pieces in rolling contact are called smooth or toothless wheels.
Shifting pieces in rolling contact with turning pieces may be called snfooth or toothless rae/es.
In a pair of pieces in rolling contact every straight line traversing the line of contact is a line of connection.
