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Pipe Organs and Related Topics

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Subject:
From:
Robert Horton <[log in to unmask]>
Reply To:
Robert Horton <[log in to unmask]>
Date:
Fri, 13 Nov 1998 18:49:57 -0600
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At 12:03 PM 11/13/98 -0600, you wrote:
>GDH made a choir Koppel flute, spotted metal, closed-felted  cap,
>44 scale, 1/4 mouth, cut 1/5th, 7" pressure that would shame a
>theatre organ Tibia Clausa for clarity and beauty.
...
>What would be wrong with a 42 scale ?
 
        Ahah! now I see the problem.  There's nothing wrong with 42 scale, but
42nd halving is almost unheard of.
        There is a great difference between the scale of an organ and the rate of
halving.  "Halving" refers to the rate at which a rank of pipes gets
narrower as you go up the rank.  For example, 17th halving means that if CC
is x millimeters in diameter...once you get 17 notes up the rank, the
diameter will be x/2
        The only example I could imagine of 42nd halving is in extremely old
organs.  Ancient organs (we're talking medieval) were built with a constant
diameter throughout the whole rank...meaning that the bass sounds stringy
while the treble sounds fluty.  Sorry, but I can't remember the source for
all this, anybody out there remember?
 
Robert Horton, Associate Minister of Music
St. Lawrence Catholic Campus Center
1800 Engel Road #970, Lawrence, KS 66045
http://falcon.cc.ukans.edu/~gemshorn/
 
Q. "Do two normal people make one paranormal?"
 
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