A compact, handson demonstration device that makes the physics of rotating magnetic fields and asynchronous motors clear and observable. Key benefits Makes an abstract concept visible: the aluminum egg rotates and then stands upright, clearly illustrating eddy current drive and gyroscopic stabilization that underpin asynchronous motor behavior. Simple, precise control: stepless speed adjustment lets you change rotation smoothly; a power indicator shows operating status in real time. Built to last and easy to use: solid materials and thoughtful construction provide a feel and reliable performance for frequent demonstrations or display. How it works An aluminum egg (30 mm x 50 mm) is driven by a rotating magnetic field. Eddy currents in the egg produce torque, causing it to rotate about its long axis. After acceleration the egg stands upright due to the gyroscopic effect, demonstrating the transition from rotation to stable precession. Materials and build Aluminum demonstration egg with durable, glossy coating for longterm appearance. Solid wood base with nonslip, wearresistant finish and stable center support. Metal toggle switch secured with rivets for reliable operation. Wooden rotating disk paired with the aluminum egg for a tactile and visual experience. Dovetail hinge for smooth opening and closing. Controls and performance Stepless speed adjustment button for precise control of rotational speed. Power indicator for immediate status feedback. Compact overall footprint suitable for desktop or lecture use. Specifications Egg size: 30 mm x 50 mm. Materials: aluminum egg, solid wood base, wooden rotating disk, metal toggle switch. Design features: riveted switch, stable center support, dovetail hinge, glossy coating, nonslip base. Practical applications Classroom and laboratory demonstrations: show students the effects of rotating magnetic fields, eddy currents, and gyroscopic stabilization in a clear, repeatable way. Instructor or public demonstrations: use during lectures, science outreach events, or museum displays to make motor principles intuitive. Desk display and collection: a compact, wellmade device that doubles as an educational conversation piece or collector item. Why choose this device Delivers a clear, physical demonstration of key electromagnetic and rotational dynamics. Durable construction and intuitive controls make it suitable for repeated use in educational settings or as a collectible display. Compact size and refined materials balance functionality with an attractive presentation.