Elliptic friction wheel 1 rotates about fixed axis A, passing through a focus of the ellipse, and contacts friction wheel 2. Lever 3 turns about fixed axis B and is connected by turning pair C to wheel 2. When wheel 1 rotates, wheel 2 has a complex motion consisting of rotation about axis C and oscillation about axis B. Wheel 2 is held by gravity in contact with wheel 1.
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