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A little hot-cold air machine made within 2 h work. My first try, so I'm happy it just worked. Yes, it runs on top of a wood stowe. 
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Razvan-Mihai Dudu's profile photoAnders Jackson's profile photo
 
Yes, it is also known as Stirling machine. But it's easier to understand how it works if you think about it as a hot-cold air machine. ;-)
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