Klarinet Archive - Posting 000206.txt from 2010/08
From: Nitai Levi <clarnibass@-----.com> Subj: Re: [kl] About clarinet acoustics Date: Tue, 17 Aug 2010 09:14:39 -0400
>> 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 instrument=
s' =
acoustics classes in university. I might read that email but I'm writing he=
re =
more to offer measuring what others were interested in and no so much to fi=
nd =
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 al=
most =
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 differe=
nce.
Nitai
=
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