Handcranked wave machine demonstrator designed for clear, handson teaching of wave motion. The device uses 24 eccentric wheels mounted on a single shaft to produce visible transverse waves, making abstract wave concepts easier to understand and explain. Key benefits Clear visualization: Twentyfour eccentric wheels on one shaft create smooth, repeatable wave patterns that students can see and analyze. Manual control: Handcranked operation lets instructors vary speed and observe changes in wavelength and frequency in real time without power requirements. Durable for classroom use: Constructed from plastic with metal components to withstand regular demonstrations while maintaining reliable performance. Portable and easy to store: Compact dimensions of 40.5 x 10 x 30 cm make the unit easy to carry between classrooms and simple to store when not in use. Ready to use: Each package contains one handcranked wave machine demonstrator, so you have everything needed to begin demonstrations immediately. Functions and attributes Function: Demonstrates wave propagation, superposition, standing waves, and the relationship between amplitude, frequency, and wavelength. Compatibility: Suited for physics classrooms, teaching labs, lecture demonstrations, and outreach events; works on any stable table or demonstration surface. Material and construction: Plastic housing and components with metal parts at key points for strength and consistent mechanical action. Performance: Mechanical singleshaft design ensures synchronized motion across all 24 wheels for consistent and repeatable demonstrations. Practical use scenarios Classroom lecture: An instructor can cranked slowly to show basic transverse wave motion, then increase speed to illustrate changes in frequency and wavelength. Laboratory experiment: Students can record wave patterns for analysis, compare wave parameters, and investigate standing wave formation by adjusting crank speed. Public demonstration or outreach: Portable unit makes it easy to illustrate fundamental wave concepts in science fairs, museum exhibits, or outreach workshops. This demonstrator provides a simple, reliable way to turn theoretical wave concepts into visible, controllable experiments suitable for teaching and handson learning.