The initial concept for this type of Stirling engine was developed by Wilfried Schlagenhauf in Germany in 1991. Mr. Schlagenhauf, a school technology teacher, originally came up with the concept in order to better demonstrate the principles of Stirling engines to his students. A Stirling Engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work. It was originally utilized as an alternative for the steam engine, but was mostly used in low-power domestic items. It is, however, very quiet and efficient. Most Stirling engine designs incorporate a cylinder and power piston as well as a diplacer piston. Mr. Schlagenhauf searched for a way to eliminate the higher priced cylinder and piston arrangement. The balloon eliminated the need for the expensive, close tolerance power piston. Having the cylinder tilt away from the heat source rather than a displacer piston being pushed back and forth greatly simplified and lowered the cost of the apparatus. This kit allows you to build a close approximation of the design Mr. Schlagenhauf pioneered, and makes for an excellent classroom demonstration, science project, or family activity.
These goggles meet the American National Standards Institution (ANSI Z87.1) and Canadian Standards (CSA Z94.3) regulations.
Highly durable lab apron made of rubberized cloth is impermeable and easy to clean, perfect for all manner of lab or classroom experiments
Recommended for protection against chemical splashes. A must have for every young chemist!
Durable, anti-fog safety glasses that fit comfortably on any head size.
Extra-small nitrile exam gloves designed and manufactured for superior protection against viral, bacterial, and certain chemical hazards.
These goggles meet the ANSI Z87.1, 2010 High Impact standards.
View the glory of space with this hi-tech telescope set!
This classic device is used to demonstrate the conservation of mechanical energy.
Shake the Pet Tornado clockwise and watch the mini tornado funnel form before your eyes!
Every kid needs one of these spheres!
Build over 100 exciting electronic projects with this easy to use kit!
A combination of three of our great discovery toys, all in one package!
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