.....can be imagined , so to provide something new :automatic pumping of water instead of hand pumping.
Some details regarding shadouf , at : http://en.wikipedia.org/wiki/Shadoof and
www.youtube.com/watch?v=foxnr-FzgXY
If we replace the (long pole+bucket) spare parts of the "old" shadouf , with the (long belt+bucket) / "yellow" spare parts from :
http://www.geocities.ws/iacob_alex/Some_Drafts/text036.jpg
...we have a new configuration...easy to test and play the variable/oscillatory leverage , as a self-motion due to a continuous unbalance and inertia.
Al_ex