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To my knowledge this type of engines where among the first to be able to operate, before 1700. They used gunpowder to heat the air inside the cylinder when the piston was in its lower position. Then a valve was closed and when the air was cooled the pressure decreased and "sucked" the piston up...

I use this model to measure when spring has arrived with my grandchildren. Living on the latitud 55,3 N it takes a while before the insolation is high enough to beat the internal friction. Year: 1980-ish Model: Solar Powered Engine: Stirling