Scott,
Then why is it that inserting the hand gradually lowers the pitch? --Carson
From: "scott young" <[EMAIL PROTECTED]> Reply-To: The Horn List <[EMAIL PROTECTED]> To: "horn" <[EMAIL PROTECTED]> Subject: Re: [Hornlist] Stopped Horn Pitch Date: Sat, 11 Sep 2004 18:21:06 -0400
Carson,
Because of the flare of the horn bell, the last node of the wave length is a few inches outside of the length of the horn. Placing you hand in the bell intensifies this effect (in essence, adding the length of your hand to the length of the tube). When you stop the horn with your hand, you move the node back (In other words, shorten the tube) to where your hand is closing the horn. This effectively shortens the F horn by a half step, depending on the bell size and the size of your horn.
Respectfully,
Scott
----- Original Message -----
From: carson smith
Sent: Saturday, September 11, 2004 5:39 PM
To: [EMAIL PROTECTED]
Subject: [Hornlist] Stopped Horn Pitch
I am doing a report for a basic acoustics class on hand stopping. It
involves a 1-2 page write up and a five minute presentation. From what I
have read so far it seems as though the hand lowers the harmonic series as
it is inserted by decreasing the number of standing waves. What I do not
understand is why there seems to be a sudden semitone rise in pitch when it
is fully stopped. Can anyone explain this to me or point me toward some good
references? Thank you, Carson
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