Pulley Large Demonstration Triple, Designed for Classroom Demonstrations, Light-weight, low-friction, and deformation-resistant plastic ensures accurate results, Open to make it easier for users to run pulley cords through them
Resonance Bowl (Chinese Spouting Bowl) 15in diameter with a Teacher Guide.Due to the vibrations caused by the rubbing of the handles, the water surface begins to ripple around the rim.Soon water drops shoot up quickly becoming continuous streams called standing wave.