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

You can see my design at this link. The idea is that a falling 
weight provides the energy to turn a solar panel or heat engine. 
Without the control line, the weight would fall down all at once.
But the turntable is clamped to a control line with a clothespin. 
When the clothespin is squeezed, the turntable slips forward. The 
force to squeeze the clothespin is provided by a blackbottle/float 
combination, and of course, buoyancy. The key is to make it so that 
the blackbottle has a blind that just barely shields it from the sun, in 
such a way that the blackbottle is exposed just as soon as the turntable 
turns too far. A friction brake keeps it from going too far before it can 
react to shading.
http://home.earthlink.net/clanl/nonelectricsolartracker.gif