Klarinet Archive - Posting 000441.txt from 2001/06

From: Mark Thiel <thielm@-----.com>
Subj: [kl] open tubed vs. closed tube?
Date: Thu, 14 Jun 2001 17:25:00 -0400

David Motz wrote:
>But with an organ pipe it is not the reed end of the pipe which is
stopped,
>but rather the "bell" end.

I think that if an organ pipe is stopped, it is a fipple type pipe, not
a reed pipe.

We don't just have open and closed pipes. We have open both end, closed
near
end, closed far end, and closed both ends. (Where near is "up" for
woodwinds
but most organ pipes are upside down and flutes are sideways).

In reed pipes, the reed is closed enough of the time that the reed end
is
effectively closed, so the near end is closed. Flute tone hole
ends or recorder fipple ends function as open ends.

Closed far end pipes are represented by some organ pipes, pan pipes,
and slide whistles.

Do closed both end pipes exist? Well if it were really closed you would
have
to be inside it to experience it! But some air can leak by a reed, and
it
can also leak out without effecting the official "closedness" status.
An
example was discusses on this list a while back -- you can stop up the
far
end and all the holes except for perhaps the register hole of a clarinet
and sound
bugle calls. I believe that the clarinet is then functioning as
closed both ends? Are there really organ pipes that do this -- anyone
know?

Mark Thiel

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