Tuning instability question

[John Minor]

On Mon, 5 Feb 1996, John W. McKone wrote:

> John,
>
> The humidity levels in a performance hall increase quite a bit when you
> fill it with lots of (hopefully) breathing bodies.  Seems to make sense
> that this effect would be more pronounced at lower starting humidity (i.e.
> when the hall is empty and you are tuning)  Is the instability you mention
> in the unisons, or is the middle of the piano going sharp on you?  If the
> latter is true, you might try modifying your stretch to compensate.
>
      John: Good point!! I'll make sure to set the thermograph somewhere in
the hall (out of the way) during the next performance to record the change
that takes place! It is the unisons that are wandering, and it was during the
second half of one of the recitals that was the worst case.

John Minor