This is an element on one of the hand powered sculptures that I made for Funique.
The elements I used had to be able to handle marbles quickly because the kids
might turn the handle as fast as they could. On this fun element, the 2" marbles are
directed around the outside of the long arms painted blue and yellow. This turned
the wheel. In the movie you can see that the center of the wheel had tines that stick
out and pick up 1" marbles, raising them to a track above. They race back to the right
turn around and come back for another lift up the farris wheel.

This Youtube video shows this element in action, take a look!