<HTML>In a message dated 4/24/2002 8:19:45 AM Pacific Standard Time, pianobuilders@olynet.com writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Installation & MC Date:4/24/2002 8:19:45 AM Pacific Standard Time From:<A HREF="mailto:pianobuilders@olynet.com">pianobuilders@olynet.com</A> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> Sent from the Internet    Del ,Ron   Del Wrote You are referring to an effect you notice at the point of initially gluing the soundboard assembly to the rim. Certainly the soundboard assembly is stiffening up. You are changing it from a free-floating panel to a clamped-edge panel. Apples and pomegranates in the context of this discussion. </BLOCKQUOTE> Del& Ron >>>>>And this really was my main point that it does  stiffens up considerably which is certainly some part of the dynamic equation for its ablity to produce tone. Perhaps not stated very well but in our ongoing discussions about the rims and board function this one little piece of the pie seems to be ignored or at least not considered as important.     No it isn't germain to the tension resonator argument and I wasn't supporting it although that's where the discussion  started. I was merely making the point that this stiffening from gluing the panel to the rim is important. Although I'm calling it a supporting agent I don't /didn't imply that this is how the crown in the board was derived in the first place nor will it keep it from going away over time. Perhaps I was unclear. I (and, presumably, M&H) am referring to an effect expected to last through the <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">ages. </BLOCKQUOTE>   >>>>>I know And I don't subscribe to that either     I would respectfully suggest that you read up on the phenomena of wood creep. <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Look specifically at wood deformation under load over extended periods of time          .Del</BLOCKQUOTE> >>>>>Thank you. Your respect is well recieved.    I am keenly aware of  wood creep and compression set especially when it comes to board longevity. I too see it in almost every old board I remove.      On a different note since some of the old compression crowned boards survived for longer than they should have based on our experience with them it will be disappointing not to be around to see just how long the modern variety rib crowned board will survive tonally by comparison. >>>>>>>>>Dale Erwin>>>.. <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"> <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">----- </BLOCKQUOTE> </BLOCKQUOTE> </HTML>