Terry,
Please tie a long rope to a wall, stretch it and
pluck it. You can SEE the vibrations bounce off the
wall, and head back your way !!!
This might be audibly "moot" in piano
construction, on a bridge 2" tall; but it is quite
scientifically demonstrable that vibrations travel
WITH the grain more rapidly than ACROSS it. ( There
goes that "density " thing , again! Gosh! )
The fact that so many superb manufacturers used
verically laminated bridge cores in the past may
really just be a sign that they were dedicated to
sqeezing out every drop of energetic efficiency they
could, in what was once a very competitive market.
( And they didn't have the Internet to goof off on,in
1898, absorbing their "time energy"! )
Thump
--- Terry <terry@farrellpiano.com> wrote:
> Nawwwwwwwwwww. Your skipping rope is just like the
> speaking length of a
> piano string. You pluck it or whack it and it
> vibrates. Period. It vibrates.
> The length of time it vibrates will vary directly
> with the
> solidity/immobility of the speaking length
> terminations (a cast iron capo
> bar works better than a hunk of loose rubber).
> Similar with the soundboard.
> It vibrates. The more solid/immobile/massive the
> rim, the less the
> soundboard can vibrate the rim, and the less energy
> is lost at the rim. I
> really don't think there are things zipping back and
> forth and bouncing off
> this or that. I do know that it makes for great
> graphics in four-color
> brochures. That kind of thinking is consistent with
> the thinking that bridge
> wood/laminations need to have the grain oriented a
> certain way so the sound
> energy can pass through the bridge from the strings
> to the soundboard. Don't
> think so.
>
> Terry Farrell
>
>
> > Hi Terry,
> >
> > Take a skipping rope. Tie it to a concrete wall or
> some other massive
> > object. Put a pound of tension on it. Now "pluck"
> it. Does the wave
> > dissipate when it strikes the wall or does it
> "reflect" back from the
> fixed
> > end of the rope? I'm certain that it is part of
> the reason that pianos
> with
> > massive rims generally exhibit good sustain.
> >
> > At 11:31 AM 19/02/2005 -0500, you wrote:
> > > What do you base this on? Does anyone know the
> > >origin of this kind of thinking?
> > > Not even Steinway marketing would agree with
> this:
> > >Terry Farrell
> >
> > Regards,
> > Don Rose,
>
>
> _______________________________________________
> pianotech list info:
> https://www.moypiano.com/resources/#archives
>
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