<!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 5.50.4134.100" name=GENERATOR></HEAD> <BODY bgColor=#ffffff> <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. = 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> <DIV><FONT face=Arial size=2>Actually, I 've been hearing Dale tune = and voice while I work and if he says he can hear a difference in the two boards, = I believe him.</FONT></DIV> <DIV><FONT face=Arial size=2>Keith R</FONT></DIV> <DIV><FONT face=Arial size=2>Associate PTG</FONT></DIV> <DIV> </DIV> <DIV>Message ----- </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=ron@overspianos.com.au = href="mailto:ron@overspianos.com.au">Ron Overs</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> Saturday, July 06, 2002 = 6:31 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Bridge = design</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV>Interestingly, something I have noticed about transition bridges = is that they also need an extension running out from their treble end, to = increase the impedance. </DIV></BLOCKQUOTE></BODY></HTML>