This is how the top of the lever is moved in an elliptical orbit...
The crossbar that oscillates back and forth has a little wheel or bar at the ends and the lever is connected to that little bar or wheel. The little wheels go in a perfect circle, but over the journey of the movement of the long bar going back and forth, it traces an elliptical orbit. On the movement towards the right, you see it going on the top half of an ellipse and on the way back to the left, it traces the bottom half of the ellipse.


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