3D32.17 - Demo Lab Whistle
Demolab built whistles large enough to see how they work. Use air supply to hear them running.
Include the air supply, the large clear whistle, the yellow boared out whistle, and the plastic green store bought whistle.
Place the hose of the air supply to the opening in the whistle. Turn on the air supply and observe the frequency of the whistle as it is blown. Explain how the shape of the chamber causes the air to rotate around and activate as it encounters the knife-edge of the far side of the whistle.