A stirling engine is a marvel of thermodynamics using the expansion in air volume and pressure as its heated to drive a piston. A curiosity of the industrial revolution, read all about it on wikipedia. This mini stirling engine is steampunk, cool and beautiful, plated in 24K gold and in perfect shape. It runs on alcohol and impresses your friends. I bought it on MiniSteam for $325 and its still selling there for $275 right now. You can have your very own for $225.
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