Klarinet Archive - Posting 000669.txt from 2000/08

From: Roger Shilcock <roger.shilcock@-----.uk>
Subj: Re: [kl] Plastic, wood and the G hole
Date: Wed, 23 Aug 2000 05:38:27 -0400

I don't think I understand this. The standing wave is in the air inside
the
tube, not the material of the tube.
Roger S.

On Tue, 22 Aug 2000, William Wright wrote:

> Date: Tue, 22 Aug 2000 17:52:13 -0700 (PDT)
> From: William Wright <Bilwright@-----.net>
> Reply-To: klarinet@-----.org
> To: klarinet@-----.org
> Subject: [kl] Plastic, wood and the G hole
>
> Plastic vs wood has been talked to death, but still I want to say
> something:
>
> An interesting demonstration would be to set up a machine that
> produces a tone by blowing into a simple tube of some sort. Because of
> its simplicity, the tube could be replicated in various materials, and
> presumably the machine would blow in a repeatable manner.
> Then just swap tubes and see what happens to the frequency
> analyses.
>
> Since a standing wave involves reflection of colliding masses, and
> since every action produces an equal and opposite reaction, I believe
> that the mass (weight, if you wish) of the tube must affect the distance
> travelled by the tube during its 'recoil'. Therefore phase
> relationships of the reflections will vary with materials of differing
> density, and so will the final shape of the 'summed' standing wave.
> The question is: Will the effect be large enough to be noticeable
> to the human ear?
> Since a sound wave is also a pressure wave, we must ask about the
> compressibility of the material as well as its mass.
>
> As a practical matter, does the different in wall thicknesses of G
> hole chimneys tell us anything about these questions? Are the
> differences (that I have described in other messages) merely the
> manufacturer's convenience based on which machine tool(s) the
> manufacturer happens to own? Or is there an acoustic motive behind it?
> Certainly if a thinner wall has an acoustic effect, then so does
> the material.
>
> As a recent (very recent) ex-owner of plastic and a new owner of
> wood, I cannot convince myself that the difference in 'feel' while
> playing my new wood instrument is merely its weight.
>
>
> Cheers,
> Bill
>
>
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