Hi Ron, I agree that all things have to be taken into account. But which way does each item work? Towards or away from smear? There are those occaisional pianos when no matter what the humidity is the unisons and pitch level stay wonderfully. And yes they have crown. My hunch is that the plate is moving *more* than the soundboard...in the area of c7 for example. Another hunch is that the upwards movment of the sound board (which is an actually arching) causes a vector of force to twist the bridge counter clockwise. Lets try to consider each possible factor and with a *thought* experiment decide whether it would cause pitch to rise or fall. Then if we add all theses compenents perhaps some cause and effect could be seen for the smearing of the unisions--other than the broad brush of humidity. In terms of a disease...what is the *vector* of the smearing of the unisons. At 05:13 PM 08/21/2000 -0500, you wrote: >>Hi Ron, >> >>So your *take* is that the bridge is rolling to some extent? And that the >>uneven tail lengths cause the smearing of the unisons? > > >Hi Don, >No, my take is that the bridge is rising and falling with the soundboard >crown with humidity swings. Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts drose@dlcwest.com http://donrose.htmlplanet.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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