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Ruben's Tube
# 3D30.50

Description: Standing sound waves are made visible by placing a speaker near a membrane covering a tube with evenly spaced holes drilled along its length. Propane gas is pumped into the tube and ignited, creating a row of flame that reacts to differences in pressure caused by the standing sound wave.

Instructions: place the lab speaker up against the silicon membrane until they are just barely separated. Ensure the propane line is connected securely, and then turn on the gas. Ignite the gas using a lighter and ensure all holes are lit, then turn on the frequency generator and alter the frequency until a resonance event is observed. As a note, excessively high amplitudes may cause distortions in the flame, or even extinguish some holes.

Hazards: care should be exercised around the open flame.

Purchased/Built: built

Setup Time: <5 minutes

Quant. in Demo Room: 1

Demo References
Hilton S-2h A horn driver is used as a sound source.
Sutton S-130 Drill a line of holes along a downspout and drive one end with a loudspeaker and introduce gas in the other. Flames indicate nodes and antinodes.
Meiners 19-3.5 Directions for building a Ruben's tube. Picture, Diagrams.
Freier and Anderson Sa-16 A gas filled tube with flames from a row of holes along the top and a speaker at one end.

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