Sound waves (The behavior of soundboards)

[Ron Overs]

>On Fri, 11 Jan 2002 00:20:30
>  Robin Hufford wrote:
>. . . For example, athough I think it likely the bridge motion proponents will
>  >contest this, and I await the next ingenious denial, their ideas 
>would suggest that
>  >the agraffe itself must be moving similarly to the bridge, 
>although on an obviously
>  >reduced scale- that is rocking fore and aft, flexing side to side 
>and moving the
>>plate underneath it.  I rather doubt it.

Phil Ford wrote:

>. . . No I don't contest or deny it.  This is consistent with the 
>idea of force being applied by
>the string to its supports as it vibrates.  If a force is applied, 
>unless the agraffe
>and plate are infinitely stiff then they must move.

Exactly Phil!

>This seems consistent with
>what the designers try to do - make the agraffe and plate system 
>very stiff here
>so that they move as little as possible so that string energy is 
>dissipated as little
>as possible at this point.

Agreed - plates and agraffes don't make particularly good sound boards.

Ron O.

-- 
                  OVERS PIANOS
        Grand Piano Manufacturers
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