Klarinet Archive - Posting 000429.txt from 2004/06

From: ormondtoby@-----.net (Ormondtoby Montoya)
Subj: Re: [kl] Nodes
Date: Sat, 26 Jun 2004 11:58:56 -0400

Tony=A0Pay wrote:

> A 'rule-of-thumb' statement is that the
> pressure nodes and antinodes of the second
> mode of vibration of a given fingering occur
> roughly a third and two thirds of the way down
> the instrument from, I suppose, slightly below
> the mouthpiece tip to the first open hole of the
> fingering.

I haven't spent time with these ideas yet, but....

The distance from mouthpiece tip to first openable hole on my Bb (side
trill keys) is ~16.5mm. This means that 2nd mode nodes and anti-nodes
are formed inside the barrel (9mm-11.5mm from mouthpiece tip) for at
least some pitches, and it's the barrel that I'm interested in because
it's one of the few things that I can make myself with the few tools
that I have.

It seems fairly easy to get on-the-needle intonation of 1st mode notes
and still leave room for investigating timbres, but, as has been
frequently pointed out to me, it's the intervals above the first mode
that fail most easily.

....anyway, thank you for the rule-of-thumb.

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