termination and inharmonicity ?

[Richard Brekne]

Joe & Penny Goss wrote:

> Radius Ric,
> Does this hold true for bass strings as well? Or how  does one change the
> inharmonicity of a bass string?
> On the level

grin... the profile of the termination point does have an effect on any and
all strings (relating to inharmonicity.. and for that matter several other
characteristics.)  Course if it was just as simple as dealing with these
things then all would be easy.. but as in most things in dealing with pianos
if you choose one solution.. then you sacrifice something else.

I dont think anyone has ever tried employing termination point profiles as
part of an overall scale design. Sounds a bit daunting to begin with. In any
case I doubt there is any hard data showing what could or cant be
accomplished this way.

>
> Joe Goss
> ----- Original Message -----
> From: Richard Moody <remoody@midstatesd.net>
> To: <pianotech@ptg.org>
> Sent: Sunday, February 13, 2000 7:28 AM
> Subject: termination and inharmonicity ?
>
> >
> >
> > ----------
> > > From: Richard Brekne >
> > >
> > > The sharper and thiner the front termination point the lower the
> > inharmonicity,
> > > and the rounder and wider the termination point the more. This
> > due to the fact
> > > that the thin and sharp allow for more flexing about the
> > termination point, with
> > > more bending attributed to the wide and round...
> >
> > As long as the wire wasn't yanked up to "level" it,  thereby
> > destroying the elastic curve around the "termination point".  Easy
> > to "imagine" the inharmonicity being screwed up if that happened.
> > So whether it (wire) "flexes" more on "the thin and
> > sharp",(termination)  or "bends" more with the "wide and round"
> > I don't see how this affects inharmonicity.  Experiments could be
> > done.
> >   So far I haven't seen inharmonicity formulas that consider
> > termination
> > radius. ---ric
> >
> >

--
Richard Brekne
Associate PTG, N.P.T.F.
Bergen, Norway