Changing Inharmonicity

[Don]

Hi Robert,

I am basing this on years of data I collected on pianos from FAC measurements.

At 07:20 PM 10/29/01 -0500, you wrote:
>Don Rose writes:
>
> >Unfortunately inharmonicity does change with humidity levels. It makes a
> >significant difference on a SAT or RCT. The verituner would be even more
> >likely to show deviations as it does so much more measuring.
>
>I don't believe this has ever been demonstrated conclusively.  Are you
>sure that most of the so-called inharmonicity variation is not due
>to measurement error?  To see what I mean, get five techs together at
>the same time and let them each measure the inharmonicity of several
>strings on one piano.  Let them use the same equipment, but don't let
>them watch each other as the measurements are taken.  Then compare
>notes.  The variations that you get in that experiment are not due to
>anything changing on the piano, but rather to the measurement process
>itself.  Once that level of variation has been established, you can
>then go on to make measurements under different humidity conditions.
>If the variation you get is substantially greater than the baseline
>variation from the first experiment, then you will have proven
>something.  Until then it is just speculation.
>
>-Robert Scott
>  Detroit-Windsor Chapter
>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

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