Klarinet Archive - Posting 000662.txt from 1998/07

From: Jonathan Cohler <cohler@-----.net>
Subj: Re: [kl] The LH Sliver Key and the Physics of Closed Tone Holes
Date: Tue, 21 Jul 1998 10:11:18 -0400

"Fearless Bob from Reno" <ClarFan1@-----.com> wrote:

>To Jonathin Cohler: Yourcontribution to the sliver key discussion (which i
>must confess I started ) (which is why they call me "fearless Bob from Reno,
>Nv.") was most informative. There seems to be a critical difference between
>"a tone hole that is covered from the top" , e.g. by a piece of electrical
>tape, (as mentioned by Bonade) and a "plugged tone hole" that you referred to
>later (and which is what i had done to my instrument). I assume the plug goes
>to the cylinder wall which would eliminate the hole altogether. Given this
>would your statement that plugging the hole would affect the intonation of
>other notes still hold true?
>

Yes. Having a hole covered at the top widens the effective local bore
diameter and increases it's effective local length.

Therefore, plugging the hole narrows the effective local bore diameter and
decreases its effective local length.

--------------------
Jonathan Cohler
cohler@-----.net

-------------------------------------------------------------------------