Sound waves(The behavior of soundboards)

[Richard Brekne]

Delwin D Fandrich wrote:

>
>
> >     If the sound is the same on both sides of a piece of 1x1 maple
> > outside of the piano however long it then follows that the soundboard has
> > a great deal to do with the difference between top and or side of the
> > bridge being struck. Have you any info about the grain direction of
> > either bridge that you tested? I've not seen a recent Steinway with a
> > good quarter sawn bridge cap. How much would this effect the differences
> > in the sound you hear?
>
> I just tried this on a Model O I'm stringing. As expected the tap on the
> side of the bridge yields a higher pitch with considerably less volume.
> Since the soundboard assembly has considerably more mobility in the vertical
> plane it would be some distressing if this were not the case. As the strings
> go on the pitch of the side tap gets even higher. Again, as expected. The
> strings add still more fore-and-aft restriction to the bridge's motion.

Curious... did you do the other part of the origional (JD's) suggested
experiment ? The part with the tuning fork. If the sound from the tuning fork is
the same from the top or the side, and yet the tap of a hammer is radically
different.... how are the two differing results explained ?....

>
> Del
> >




--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no