Sound board edges pulling inward

[Farrell]

I don't think so because the edges of most soundboards remain on a plane.

Terry Farrell

----- Original Message ----- 
From: "Mark Kinsler" <kinsler33@hotmail.com>
To: <pianotech@ptg.org>
Sent: Friday, February 06, 2004 9:04 PM
Subject: Sound board edges pulling inward


> Place a big plastic salad bowl upside-down on a flat table.  Place a
pencil
> under the bowl rim (between the rim and the table) at the 12:00 position
and
> at the 6:00 position.  Now the bowl will rock back and forth on the
pencils.
>
> Push down on the center of the bowl.  The bowl's rim will deflect into an
> ellipse.  The axis defined by the pencils will expand outward, and the
axis
> 90 degrees from that will contract inwards.
>
> It's possible that this is the geometry of certain sounding boards.
>
> M Kinsler
> 512 E Mulberry St. Lancaster, Ohio USA 43130 740-687-6368
> http://home.earthlink.net/~mkinsler1
>
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