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["WILLIAM JONES" <billj AT harborside.com>]

Here's a link where you can see a diagram of the simplest possible version.  
The circles around the edge represent 2-liter bottles that are painted black 
on the inside and silver on the outside, leaving a clear window for sunlight 
to enter on one side of the bottle.  The lines represent tubing that connects 
each bottle to its float, coincident with lever arms that communicate torque 
back to the central axis.  The device sits on a pond, allowing the air in 
each bottle to cool during each cycle.  So when sunlight strikes the top 
bottle, its float inflates, causing the device to tilt over, exposing the 
next bottle to the sun.http://home.earthlink.net/~clanl/buoyancy.gif