<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; =
charset=iso-8859-1">
<META content="MSHTML 5.50.4134.600" name=GENERATOR>
<STYLE></STYLE>
</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=Richard.Brekne@grieg.uib.no
href="mailto:Richard.Brekne@grieg.uib.no">Richard Brekne</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> September 08, 2002 1:15 =
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: New Steinway D =
problem</DIV>
<DIV><BR></DIV>Thanks Delwin.
<P>Does this item have a specific / proper name? </P></BLOCKQUOTE>
<P dir=ltr><FONT color=#000080>If there is, I don't know it. I've =
always heard
it referred to as "the bell."</FONT>
<P dir=ltr><FONT color=#000080></FONT>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px">
<P>I'm not sure I understand your point about damping here. I thought =
you were
of the opinion that the problem with internal damping was that it =
absorbed to
much energy, tho here you are concerned about the plate actually =
vibrating to
much, and the purpose of the device itself supports you. =
</P></BLOCKQUOTE>
<P dir=ltr><FONT color=#000080>Only in a perfect world are vibrating =
string
terminations unaffected by vibrating strings. In our world things aren't =
so
clean. </FONT>
<P dir=ltr><FONT color=#000080>The whole meaning of 'high internal =
damping'
means that vibrating energy transferred into the material in =
question--from
whatever driving source--is readily absorbed and converted into heat. =
Gray iron
is massive (but not perfectly massive) and it is moderately stiff (not =
perfectly
stiff). The bell/bolt arrangement effectively adds both mass and =
stiffness to
the hitchpin panel, reducing the amount of energy this panel easily =
accepts from
the strings, hence keeping more energy in the strings to be used to move =
the
bridge.</FONT>
<P dir=ltr><FONT color=#000080>Del</FONT></P></BODY></HTML>