Inharmonicity - so what actually causes it ?question

[Jim Coleman, Sr.]

A more narrow elliptical motion would be expected without the oscillating
side to side. This would depend somewhat on how squarely the hammer hits 
also.

Jim Coleman, Sr.

On Fri, 14 Aug 1998, pianoman wrote:

> Hello,
> Are you saying that if the bridge pins were not at an angle the string
> would NOT vibrate in a cyclical pattern?
> James Grebe
> R.P.T. of the P.T.G.
>  Since 1962 in St. Louis, MO
> Home of Handsome Hardwood Caster Cups
> pianoman@inlink.com        
> 
> ----------
> > From: Jim Coleman, Sr. <pianotoo@imap2.asu.edu>
> > To: JIMRPT@aol.com
> > Cc: nhunt@jagat.com; owner-pianotech@ptg.org; pianotech@ptg.org
> > Subject: Re:  Re:  Re: Inharmonicity - so what actually  causes it ?
> > Date: Friday, August 14, 1998 1:48 AM
> > 
> > Hi Jim B:
> > 
> > I is just a po desert rat, but when I was at the Conn Co. with Charles
> > Walter and Dr. Kent, we did studies using calibrated strobe lights. We
> > could see that the angled bridge pins caused the strings to vibrate in
> > an elliptical pattern whose major axis oscillated from side to side by
> > about 5 degrees.  You are probably visualizing the same thing. I don't
> know
> > for sure if that contributes to inharmonicity though. I do know that the
> > lower partials of a note are more erratic in the Tenor area near the end
> > of the bridge. I am guessing that it has something to do with the
> insecurity
> > of the soundboard in that area or perhaps the end of bridge effect.
> > 
> > Jim Coleman, Sr.
> > 
> > On Thu, 13 Aug 1998 JIMRPT@aol.com wrote:
> > 
> > > 
> > > In a message dated 8/13/98 8:04:34 PM, pianotoo@imap2.asu.edu wrote:
> > > 
> > > <<As far as I know there is only a small effect on the inharmonicity
> caused
> > > by the terminations,>>
> > > 
> > > Thanks Dr. J;
> > >  What I am visualizing is the different paths of vibrations reflecting
> from
> > > either end i.e., capo/agraffe end..mostly down & bridge/pin end....
> mostly up
> > > but also slightly down and sideways at the same time. Thereby changing
> the
> > > standing wave/partials differently at each end. Also the
> soundboard/bridge
> > > flexing much more than the agraffe/capo end.................
> > > Hey, what do I know I's jus a po country boy :-)
> > > Jim Bryant (FL)
> > > 
>