Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
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Sterling Engine Clock

A Masterpiece of Complexity
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Through a delightfully complicated and beautiful system involving two inversely-polarized sterling engines, a complex system of gears and discs, and a backup battery, the Sterling Engine Clock tells time forever while you stare at it, contemplating the mysteries of the universe.
Spacecoyote, Nov 17 2007

Beverly Clock http://en.wikipedia.../wiki/Beverly_Clock
Driven by variations in atmospheric pressure and by daily temperature variations, running since 1864. [Spacecoyote, Mar 16 2011]

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       Far more fuel-efficient than my internal combustion engine clock. [+]
shapu, Nov 18 2007
  
      
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