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) > >
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