Soundboard grain angle (was Negative bearing)

[Phillip L Ford]

On Mon, 3 Dec 2001 11:04:07   
 Delwin D Fandrich wrote:
>Most of the effective rigidity
>of the soundboard system comes from the ribs. As you point out wood,
>especially soft woods such as spruce, are not particularly stiff across
>grain. Hence the ribs. Stiffness along the grain of the soundboard panel is
>of less significance than we usually give it credit for. It does have a
>considerable (positive) effect through the highest part of the treble and a
>generally negative effect through the low bass. (Assuming a conventional
>soundboard/rib configuration.)
>Del

Why does the grain have a positive effect in the highest part of the treble?

Phil

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Phillip Ford
Piano Service & Restoration
1777 Yosemite Ave - 215
San Francisco, CA  94124