Klarinet Archive - Posting 000129.txt from 2010/08

From: "Keith Bowen" <keith.bowen@-----.com>
Subj: Re: [kl] Location of antinodes of vibration in an air column
Date: Sun, 15 Aug 2010 07:46:48 -0400

Yes, it is much more complicated and also depends on frequency. That's why
in my own calculations I chose toneholes rather than the total length.

Keith

-----Original Message-----
From: Jennifer Jones [mailto:helen.jennifer@-----.com] =

Sent: 15 August 2010 10:23
To: The Klarinet Mailing List
Subject: Re: [kl] Location of antinodes of vibration in an air column

On Sun, Aug 15, 2010 at 2:14 AM, Tony Pay <tony.p@-----.org> wrote:
> On 15 Aug 2010, at 00:18, Keith Bowen wrote:
>
>> I, too, am surprised that the distance from the reed tip to the antinode
is as much as 8 cm. This doesn't correspond with some quite detailed
measurements and calculations I made last year of bass clarinets to
determine their pitch (not being allowed to play museum specimens).
>
> I think I see where the 8cm problem is. =A0Diego has made the assumption
that the 'speed of sound' in the clarinet tube is the same as the speed of
sound in open air.
>
> But we know that that speed can vary according to other parameters -- for
example, the 'shoelace-down-the-tube' experiment, that changes the pitch of
a clarinet as much as a semitone, demonstrates it. =A0And I seem to remember
(stuck here in Siena without access to references) that there is something
about the diameter of even a theoretically smooth tube....
>

What about the end effect approximation? The "End corrections are
more complicated in real instruments" section at
http://www.phys.unsw.edu.au/jw/musFAQ.html#end indicates that the end
effect approximation is more complex than L+2a for instruments with
bells. I have followed several links so far and have not found
anything more specific than that yet.

-Jennifer
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