Klarinet Archive - Posting 000074.txt from 2001/03

From: Tony@-----.uk (Tony Pay)
Subj: Re: [kl] Re: Strange clarinet, finding key/pitch?
Date: Sat, 3 Mar 2001 08:04:03 -0500

On Sat, 3 Mar 2001 07:28:11 -0500, deehays@-----.net said:

> On Friday, March 02, 2001 7:13 PM <DGross1226@-----.com> (Don Gross) said:
>
> > In a message dated Thu, 1 Mar 2001 20:31:15 -0500, nocturne@-----.com
> > said:
> >
> > > (* This clarinet was sold in an odd old 3-clarinet case with two
> > > other longer clarinets of identical keywork, S/N J1xx and K4xx,
> > > which after a bit of testing I find are definitely modern-pitch A
> > > and Bb instruments, respectively.)
> >
> > I've missed the first part of this thread. Would it help to measure
> > the combined lengths of the upper and lower joints? For example, the
> > combined length of the upper and lower joints on my Buffet A
> > clarinet is 19-5/8 inches, my Buffet Bb clarinet is 18-1/4 inches,
> > and my Noblet C clarinet is 15-15/16 inches. Seems like this might
> > provide some further insight.
>
> I believe that it would be better to measure the total length of the
> clarinet not just the combined length of the two large joints. Barrel
> lengths are not necessarily consistent from manufacturer to
> manufacturer or from era to era. For example, I have a Pruefer
> clarinet and a Leblanc clarinet. Both are Bb instruments. The
> overall length is the same but if you take just the upper and lower
> joints, the Pruefer is shorter. The key holes do line up but the
> Pruefer has less length above the register key. This length is made up
> in the barrel.
>
> Also pitch of an instrument is not only a function of length but of
> the length/diameter ratio. I've seen a formula for this but I don't
> happen to have it.

He's already got it going, though....

BTW, you might be able to get it going even better, Eric, using a
technique described in:

http://www.sneezy.org/Databases/Logs/1999/01/001412.txt

The thing about the formula is, the only way you can establish it is by
both blowing and measuring clarinets. If it's in a condition to be
blown, you don't want to measure it and apply the formula, because you
might get the wrong answer by failing to include an important parameter,
like whether the mouthpiece is parallel or conical.

Roughly speaking, internal consistency of scale helps you determine the
appropriate mouthpiece, and then perceived pitch using that mouthpiece
delivers the answer.

There's some degree of latitude, because you can get instruments to go
fairly satisfactorily over a range of about 5Hz, using different barrels
and so on.

Tony
--
_________ Tony Pay
|ony:-) 79 Southmoor Rd Tony@-----.uk
| |ay Oxford OX2 6RE GMN artist: http://www.gmn.com
tel/fax 01865 553339

... To steal ideas from one person is plagiarism; to steal from many is research.

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