Test Tube Stirling Engine

This is a very simple stirling engine using a test tube and glass marbles. Everyone can build the engine easily without the special tools, like a lathe or a milling machine. Since they can also understand easily the fundamental thermodynamics, such as 'the heat energy changes to the knetic energy', the engine is used a teaching material at the elementary and junior high schools.

Link: Test Tube Stirling Engine

Here is the information of how to build the test tube Stirling engine. There is also a movie of the engine.

Link: Hot Air Engine - Heat Energy Changes to Kinetic Energy - (PDF)

This PDF file introduces the principle and how to building of the engine (in Japanese).