3D30.35 Whirly Tube
Resonance in a pipe, overtones.
A whirly tube (a tube of corrugated plastic, also known as a corruga tube) is whirled in circles at different speeds producing resonance at different pitches, along with overtones.
-  Whirly tube
- Details of the whirly tube can't be seen in a large lecture hall, but the sound can be clearly heard.
- The pitch emitted by the whirly tube depends on how quickly you whirl it. Pitch does not increase linearly, but jumps by discrete intervals.
- If you practice in advance, you can play "Taps," a song played at military funerals.
- Hold the whirly tube at one end and whirl it in a circle.
- Adjust your whirl speed to adjust the pitch emitted.
- PIRA 3D30.35
- There's a paper discussing the theory of the whirly tube here:
F.S. Crawford, AJP 42, 278 (1974)
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