• When a tube is held over a burner at the correct elevation, a loud resonant tone is heard.
  • When both tubes are used simultaneously, they create a beat frequency.
  • Burners are connected to a small propane tank in the demo cart, the valve is at the side of the cart.
  • Open air inlet at base of burner for easier ignition, then close down to maximize white noise.
  • A fire extinguisher is available in the cart.

(open valve at propane tank, check lighter operation and fire extinguisher)
(close valve and drain gas line before storage)