But they still need an energy input !JerryVan wrote:It's a Sterling Cycle heat engine. They can operate at very small differences in heat energy.soundgen wrote:What you need is a perpetual motion machine , David Jones who used to write in New Scientist under the pseudonym of Daedalus is always making them , he used to offer a prize if anyone could work out how they were powered , they just run and run ! Here is one in the Technical Museum of Vienna
It's been going for years !
http://www.youtube.com/watch?v=UHQ33OFljOg
http://en.wikipedia.org/wiki/Stirling_engine