Strictly technical

[Ricard de La Rosa]

Delwin D Fandrich wrote:

> Ricard de La Rosa wrote:
>
> > The question about the bounding piano on New York Streets had to do with the
> > fact that the duplex section of the speaking lengths do get out of tune.  How do
> > they get so out of tune after thay have been put "in tune"?  It seems that they
> > are jarred sometimes (often in NY) in transit.  I have seen a piano jump up off
> > the floor of a truck (before being sedated again) about 6" parallel to the floor
> > and slam down with full force after moving truck hit a huge NY type pot hole.
> > That type of force, slamming, and banging as it does, can and will move just
> > about anything....including a sound board either up and away or down and away or
> > sideways and away from the bridge and its pins, etc.  Therefore, in that
> > microsecond, who is to say the aliquots do not also move?
>
> -------------------------------------------
>
> Ricard
>
> It is unlikely that the aliquot segments move even when subjected to the trauma of a
> NY pothole.  They are held quite firmly in place by the downforce of the strings.
> However . . . it is probable that the plate itself sifts around somewhat.  These
> things make up a substantial portion of the pianos weight.  They are held in place
> with a mechanism intended to hold them down against the rim/soundboard assembly.
> Not much thought is given to withstanding side stresses.  We've repaired several
> pianos in which the plates had been shifted enough to cause technical problems.  It
> is quite likely that many plates shift around enough to nicely put a piano out of
> tune.  It doesn't take much plate movement to accomplish that.
>
> Del

  Dear Del:

I guess what I'm really wondering aloud is this:   "Do you suppose the aliquots are ever
almost floating freely in space"?   Sounds craxy....but I think it happens.  I also
invested in Pan Am stock 10 years ago.

Go figure.


Ricard