Thermopile, let extract some electricity from heat without steam

[jacquesl]

This wonder wheel uses gravity also in its favor, nice, it’s like a gravity + heat engine.

 

[Nordic]

They tried building one on mythbusters -- didn't work

 

[jacquesl]

Log time, now seen, Yea your right, they did build it, but they’ve build it probably wrong. That pipe is very important, it must almost touch the button, like my love meter.
http://www.diyaudio.com/forums/attachment.php?s=&postid=1131913&stamp=1171131185