This working Stirling engine powers a rotating Ferris wheel using the same thermodynamic principles discovered in 1816 by Robert Stirling to create a more efficient alternative to steam engines. Still taught today in mechanical engineering courses to show the high efficiency, quiet operation, and heat utilization of closed-cycle regenerative heat engines, Stirling engines are powered by the expansion and compression of air. Two alcohol burners heat the chambers on the Stirling engine, causing the air inside to expand and contract and push the pistons toward the chambers. This movement displaces some of the warm air, forces the vertical pistons upward, and turns the flywheels. The Stirling engine's flywheels are connected by a rubber band to four flywheels on the Ferris wheel, powering its rotation. Made in Germany, the kit's parts are made from machine tooled solid brass, stainless steel, and aluminum components on a walnut stained wood base. Ferris wheel: 9" H x 5" W x 4" D. Stirling engine: 5" H x 6" L x 4 1/4" W. (5 lbs.)