At 12:03 PM 1/14/99 -0500, you wrote: >> >> I believe inharmonicity is almost entirely a function of things >>that go on in the string itself. When the humidity changes as much >>as you cited, the swelling or shrinking of the soundboard requires >>a significant change in tuning pin rotation to maintain standard >>pitch. This in turn changes the termination point on the string >>at the V-bar or agraffe. If a small segment of string was >>previously bent at the V-bar, but now is moved out into the >>speaking length of the string because of tuning, that little >>bend could certainly have an effect on the inharmonicity - even >>if it was only 1/16" long. >> >>-Bob Scott >>Ann Arbor, Michigan >> >> >This would mean that one could significantly change the inharmonicity by >leveling the string, which experiment should be easy enough to repeat. This >is a snow (actually an ice) day for me, so I will try this in my shop this >afternoon, post ya later with results. Would raising a pitch 20 or 30 cents >to effect this type of change be cheating? Changing it up and then down again? > Ken Jankura > Newburg, PA > On an old XYZ brand grand, restrung 7 years ago, I measured the difference between 2nd and 4th partial of G4 ; 6.3. After leveling the string ; 6.5. I raised the pitch 30 cts. ; 7.0. Leveled ; 6.3. Lowered 30 cts. below pitch ; 7.2. Leveled ; 6.8. No, it doesn't seem to make too much difference, and you can make of these numbers what you will. I tried a couple other notes, and seemed to effect about a 1 cent diff by leveling, which may point to the curvature of the bearing points as a partial (no pun intended) cause of inharmonicity changes. Ken Jankura, RPT (Reschedule Land), PA
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