Ideal for all resonance investigations in air columns. The main tube is 1 metre long and 50mm diameter and takes a high-power sound wave generator plugged into one end. The generator is driven by a standard laboratory signal generator and as the frequency is adjusted the various resonance modes are detected by increased loudness of the note. The open pipe can be studied or a variable-length closed pipe can be used by inserting the piston assembly provided. By using a higher amplitude on the generator KUNDTS tube investigations can be undertaken using fine cork or polystyrene dust distributed throughout the tube. Complete with two supports for the tube - sound wave generator - resonance tube - piston and full instructions.