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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=michael@gambles.fsnet.co.uk
href="mailto:michael@gambles.fsnet.co.uk">Michael Gamble</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> October 14, 2003 12:11 =
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Round Damper =
Blocks</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hello Jarred</FONT></DIV>
<DIV><FONT face=Arial size=2>The problem of "ringing on" in the =
bass section
has been a problem in many upright under-damped pianos. I don't think =
it was
the lack of Mass in the damper which allowed the condition, rather it =
was the
lack of damping the important nodal points. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080>Actually, it =
more than
likely is a mass problem. The idea of the vertical damper not working =
because
they do not sit directly on some node is generally overworked, often =
being used
to excuse what is simply a poorly designed damper system. You can easily =
test
this by setting up a monochord and testing the damper function at =
different
locations. They actually work pretty well over quite a broad distance if =
the
mass/spring ratio is appropriate for the frequencies they are expected =
to damp
out. Higher mass is appropriate for the bass section. Less mass is =
appropriate
for the treble section. Increased spring pressure doesn't really improve =
bass
damping. The brass damper barrel is very often a good solution to poor =
bass
damping.</FONT></DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" =
color=#000080></FONT> </DIV>
<DIV dir=ltr><FONT face="Comic Sans MS"
color=#000080>Del</FONT></DIV></BODY></HTML>