summer sharpness in low tenor

[David Nereson]

    Most pianos go quite sharp in the summer because of higher humidity, and the sharpness is most pronounced in the low tenor.  But what I've seen quite often is that the lowest plain wire strings will be really sharp, but the wound strings right next to them on the same bridge won't be anywhere near as sharp.  How does this happen?
    Also, one would think that the middle of the soundboard would experience the most swelling, which would in turn affect the mid-treble most, not the low tenor strings down there in the corner of the soundboard.  What gives?
    --David Nereson, RPT
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