h a l f b a k e r yInvented by someone French.
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Aeolian pipes, as in pipe organs, make one note per pipe, either louder or softer depending on the speed of the wind in the 'whistle' part. The pitch is determined largely by the length of the resonating pipe above and below the whistle part. One pipe, one note. They don't change pitch.
What if the
bottom of the pipe was not blocked off and a U-shaped tube partially filled with water was used to establish the bottom of the whistle part of the pipe. The other upward leg of the U would be capped by a tightly-fitted Bernoulli tube, such that air flowing though the Bernoulli raises the level of the water on that side, consequently lowering the level on the other, whistle side. Careful balancing of the volumes in the pipe, larger on the Bernoulli side, smaller on the whistle side, would establish the range of change in pitch. This is a rearrangement of a Bernoulli meter to get a different result.
The harder the wind blows, the lower the note that the whistle blows. This works out well because lower notes require more airflow.
A tuned bank of these things could be either magical or horrible.
http://www.organstops.org/a/Aeoline.html
[pocmloc, Jun 12 2023]
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The link suggests the Aeolian pipes are pitched solely by length, and further says that the pipe cannot be stopped. |
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My understanding would be that the bottom section is the air supply bit and doesn't affect the pitch, the whistley bit is in the middle, and the top section is the resonating column of air which controls the pitch. |
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Maybe I'm completely wrong and/or stupid but I don't understand how the u-bend fits in. |
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Bag Pipes versus Aeolian Pipes. Let the mortal combat begin. The winner must take on a church organ! |
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Why not just set up some banks of electronically controlled slide whistles? Am I missing something? (If so, feel free to ridicule me with a cartoon slide-whistle effect.) |
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[Ander] that would be good, but different. |
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[pocmoc] Think of a tin whistle with a slide that you move up and down. The pitch is determined by the position of the slide and you can get swoopy multi-tones that change infinitely, not note by note like a clarinet or flute. If the liquid volume of the U is moved up and down by the wind on the Bernoulli side, the liquid "bottom" on the whistle side changes and then the pitch will change. Everyone has this effect whether they know it or not; the vent pipe on a toilet will cause the toilet water to jump up and down in a storm where the barometric pressure changes due to wind across the top of the vent pipe. Sorry for the illustration... |
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Right but your idea as written does not describe a swannee organ pipe, and my understanding is that Aeolian pipes are open not stopped. |
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Rewrite and retitle the idea to describe inverted u-bend Bernoulli swannee organ pipes and buns will rain on you like buns raining down on a person. |
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[pocmloc]; given that I had only a vague idea what an "Aeolian pipe" was, I had no trouble understanding this idea. Perhaps your deep prior knowledge got in the way? |
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Your use of the word //understanding// may be a little too broad, in that case. |
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[Ander] The electronically controlled slide whistles would work for sure. But that would remove the soul of the "Inverted U-Bend Swannee Organ Pipes" which are designed to be free-standing or placed well off the beaten track, whooping away in the wind and rain totally on the natch, frightening wildlife and making campers wish they'd stayed home. Thank you |pocmloc| for the new title. It fairly trips off the tongue. |
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