<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" = http-equiv=Content-Type> <META content="MSHTML 5.00.2614.3401" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#008000 size=3>Dear list,</FONT></DIV> <DIV> </DIV> <DIV><FONT color=#008000>I haven't observed major changes in the FAC = numbers on the same piano UNLESS the pitch of the piano has changed,  i.e. I = have done a pitch raise on the piano.  I always re-measure FAC numbers after = a pitch raise and they are different.  I've assumed that it was because the = increased tension on the piano structure has changed the speaking length = of the strings.  Am I wrong?</FONT></DIV> <DIV> </DIV> <DIV><FONT color=#008000>What would change the stretch of a piano = during the same day or even between annual tunings?  Bridge roll and relaxing?</FONT></DIV> <DIV> </DIV> <DIV><FONT color=#008000 size=3>Del Gittinger, RPT<BR>Del's Music = Studio, Marion, OH<BR>Piano Tuning & Service<BR>Electronic Instrument = repairs including organs<BR><A href="mailto:delgit@acc-net.com">delgit@acc-net.com</A></FONT></DIV></B= ODY></HTML>