<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE>Re: Bridge design</TITLE> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <STYLE type=text/css>BLOCKQUOTE { PADDING-BOTTOM: 0px; PADDING-TOP: 0px } DL { PADDING-BOTTOM: 0px; PADDING-TOP: 0px } UL { PADDING-BOTTOM: 0px; PADDING-TOP: 0px } OL { PADDING-BOTTOM: 0px; PADDING-TOP: 0px } LI { PADDING-BOTTOM: 0px; PADDING-TOP: 0px } </STYLE> <META content="MSHTML 5.50.4134.600" name=GENERATOR></HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#000080></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=kpiano@goldrush.com = href="mailto:kpiano@goldrush.com">Keith Roberts</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> July 06, 2002 7:52 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Bridge = design</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Maybe gluing the bridge cap on in the = crowned position and the bridge to the sound board in the crowned position, = like Dale does, will add the necessary impedance to the treble end of the = bridge. </FONT></DIV></BLOCKQUOTE> <DIV dir=ltr><FONT color=#000080>It's not the treble end of the long = bridge that is in question here. It's the bass end of the long bridge. And no amount = of crowning the bridge to match the crown of the soundboard is = going to affect that. Or much else, for that matter.</FONT></DIV> <DIV dir=ltr><FONT color=#000080></FONT> </DIV> <DIV dir=ltr><FONT color=#000080></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV><FONT face=Arial size=2>Most of the models discussed here on = the list, didn't seem to deal with the  stiffness added by the glue = joints in a laminated structure. Usually underestimated and throws that kink = into the reality/theory gap along with a few of the other observartions Dale = has made.</FONT></DIV></BLOCKQUOTE> <DIV dir=ltr><FONT color=#000080>Would you care to explain this a = bit more? How does stiffness added by the glue joints in a laminated structure -- = assuming there is any -- affect the impedance of the very end of the long bridge?</FONT></DIV> <DIV dir=ltr><FONT color=#000080></FONT> </DIV> <DIV dir=ltr><FONT color=#000080>Del</FONT></DIV></BODY></HTML>