• When a tube is held over a burner at the correct elevation, a loud resonant tone is heard.
  • Burners are connected to a small propane tank in the demo cart, the valve is at the side of the cart.
  • Open air inlet 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)
(set out tarp for tubes)
(close valve and drain gas line before storage)