Hi Carol, Well I just measured another piano and guess what--I see the exact same effect (only less obvious). The piano in this case was an upright Heintzman from the 1920's. It was last tuned by me in November of 1997 with humidity at 35%. Today the pitch had risen 10 cents (humidity today 56%) and the tri chords all exhibited the bass wire flatter than the middle and the treble wire sharper than the middle. I did not have time to take measurements, and I was using my grey matter tuner today in any event (mostly). 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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