GLASS PISTON Laminar Flow Stirling Engine

This engine is made from glass bits that I had knocking about the workshop which just happened to fit together very nicely!

The piston is a 'sawn-off' test tube and the cylinder body and heating chamber are made from some odd looking 'blood' tubes (if anyone knows what these are supposed to be for I would love to know).

The engine exhibits very little friction and although sealing could be better it runs like a charm.
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