moving instability

[baoli liu]

Dr. Yat Lam Hong has written an article about the
subject in the journal in 1975(or 1976?).
Upright piano with four casters may be "twisted" after
moving,this will cause the pitch changeing;the grand
piano with three casters will not be twist after
moving,the pitch should be stabal.

As for the "badly out of tune" unions you mentioned,I
dont think it's because of the twist,there must be
other reasons,such as loosed or unstable pins,pitch
raise or pitch lower befor fine tuning,etc'.

Baoli Liu

--- Stephen Airy <stephen_airy@yahoo.com> wrote:
> I remember a time several years ago my family moved
> our old Hallet & Davis 52.5" upright across the
> living
> room and back.  The unisons were badly out of tune
> in
> the middle section.
> 
> --- Marcel Carey <mcpiano@globetrotter.net> wrote:
> > Hi,
> > This morning as I was tuning two U1s in a practice
> > room at the university, I used RCT for the first
> one
> > and tuned the other one aurally. To compare
> > afterwards, I moved the first piano so the two
> > keyboards would be perpendicular to each other. To
> > my surprise, the piano that I moved was flat (this
> > is the one I did with RCT). So, I took some
> > readings. In the new position, 
> > A3= -3.4¢. I returned the piano to it's original
> > position and A3 went right back to 0¢....
> > I never thought there could be so much difference
> > just by moving the thing around. 
> > So, beware,
> > 
> > Marcel Carey
> > Marcel Carey, accordeur technicien
> > (819) 564-0447
> > mcpiano@globetrotter.net
> > 
> 
> 
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