Klarinet Archive - Posting 000209.txt from 2010/08

From: "Keith Bowen" <keith.bowen@-----.com>
Subj: Re: [kl] About clarinet acoustics
Date: Tue, 17 Aug 2010 13:19:25 -0400

Nitai

That sounds consistent. Thanks.

I miswrote the name below - it is Nederveen not Vanderveen, sorry. Look in
your shelf under N not V ! =

Cheers, Keith

-----Original Message-----
From: Nitai Levi [mailto:clarnibass@-----.com] =

Sent: 17 August 2010 14:15
To: klarinet@-----.com
Subject: Re: [kl] About clarinet acoustics

>> Before doing more measurements it's sensible to see what has already been
>> done! Please see my long email about Vanderveen's book. =

=A0
I used to have that book but for some reason can't find it anymore. =

Unfortunately I also remember next to nothing from acoustics and
instruments' =

acoustics classes in university. I might read that email but I'm writing
here =

more to offer measuring what others were interested in and no so much to
find =

out myself.
=A0
>>The half-clarinet measurement would be interesting, though. Measure the =

>>bore diameter as well=A0to do the end correction.

>> Oh and you need to measure temperature inside the bore. And until the
>> clarinet warms up, there will be a big temperature gradient inside it.

OK,=A0I assembled the mouthpiece (with reed), barrel and upper joint. I let=
it
sit =

outside in the room and put a thermomoter=A0next to it. I don't have a bett=
er =

method to measure the temp.=A0It's approx 27.5c. The length is approx 341mm
(with =

I think +/-0.5mm is about right). The frequency is just a tiny bit over
257.8 =

hertz.

The bore of this clarinet is (as accuate as I can measure): 14.76mm at the =

bottom of the upper joint, 15.10mm at the top of the upper joint.

So doing the same calculation as Diego, the (1/4) wavelength for this is
almost =

337mm. That's only 4mm less than the length of the clarinet upper joint =

including barreland mouthpiece. If also doing=A0"plus 0.6 times the radius =
of
the =

end" (which I'm not sure what this is at all) then it's about 8.5mm
difference.

Nitai

=

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