Thank you for correcting me. Sorry for the confusion.
Jim Engele
Repair Technician
Osmun Music, Inc.
781-646-5756
www.osmun.com
[EMAIL PROTECTED]
- Original Message -
From: "Rob Travis" <[EMAIL PROTECTED]>
To: "The Horn List" <[EMAIL PROTECTED]>
Sent: Thursday, August 12, 2004 11:28 PM
Subject: Re: [Hornlist] Hose "A" Can You See?
> I'm not much of a master of this stuff, but if you add 6% to 14 ft 12
times,
> it will result in just over 28 ft. When you're adding a percentage to a
> value repeatedly, your base for the percentage increases, so the value
added
> increases as well (similar to compouding interest vs. simple). So if
each
> half-step is achieved by the addition of 6%, the result will not be adding
> 72%, but rather adding 101.2%.
> (To test this, take the number 100 and multiply by 1.06; this gives you
106.
> Multiply this by 1.06, and you get 112.36, not 112 even. Continue, and
> after 12 times, you're at 201.2)
>
>
> It would seem, if I remember correctly from my old acoustics class, that
> doubling the length of the tubing will double the wavelength, thus
lowering
> the pitch an octave, and the six-percent rule certainly seems to support
> this, as long as you run the numbers one 6-percent at a time.
>
> Robert S. Travis
>
>
> The only two things worth aiming for are good music and a clean
conscience.
> -- Paul Hindemith
>
>
>
> > Here is some interesting information:
> >
> > A Horn in F is approximately 12 feet long. The Bb side of the Horn is
> > approximately 9 feet long. If you want to lower the pitch of an
> instrument
> > you must add a little more than 6% to the length of the tube per
semitone.
> > Bb down to F is 5 semitones or 5 times 6%= 30%. 9ft times 130% is
almost
> > 12ft. F to D is 3 semitones or 18%. 12ft times 118% is around 14ft. D
> to
> > D an octave lower would be 12 semitones lower therefore 6% times 12 is
72%
> > added to the length (doubling works to calculate frequency when going up
> an
> > octave but it will not work to calculate the length of a closed on one
> end
> > conical tube when lengthening the tube to sound an octave lower).
14ft(D)
> > times 172% is about 24 ft.(D an octave lower).
> >
> >
> > I learned about the 6% rule from an out of publication journal of the
> > C.G.Conn Company. I forget the exact title but it was regarding the
> > construction of musical instruments and was published in the 1950's I
> > believe.
> >
> >
> > Jim Engele
> > Repair Technician
> > Osmun Music, Inc.
> > 781-646-5756
> > www.osmun.com
> > [EMAIL PROTECTED]
>
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