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Ginsberg Scientific Simplified Stirling Engine measures 11 in x 2 in x 5-1/2 in and is easy to construct. It very visibly demonstrates the Stirling engine principle. In this unit a test tube acts as the cylinder and four marbles work as a transfer piston. As air is heated on one end of the transfer cylinder, it causes the air to expand and move into the cooler end of the cylinder. Here the air cools and contracts thus causing the cylinder to lower and the cycle begins again. Stirling engine is a clear demonstration of first 19th century attempts to produce an environmentally sound, economic and efficient power source. Engine senses heat from a small candle and converts into oscillation almost immediately.