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<DIV><FONT face=Arial size=2>Hi Bob,</FONT></DIV>
<DIV><FONT face=Arial size=2>If you have ever in fustration over =
twisted a
string and then examined that string when it broke, ( Oh surely =
not I
<G>) you would see that several different lengths or segments can =
be set
in the strings length.</FONT></DIV>
<DIV><FONT face=Arial size=2>This is part of what I think causes the =
string to
wow wow. Another might be the wrap getting disloged from the =
core
along its length either due to loosening of the core and or corrosion. =
Ever see
spots of corrosion along the string? They never seem to be at the =
nodal
points where they would be any good.</FONT></DIV>
<DIV>Joe Goss<BR><A
href="mailto:imatunr@srvinet.com">imatunr@srvinet.com</A><BR><A
href="http://www.mothergoosetools.com">www.mothergoosetools.com</A></DI=
V>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 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=BobDavis88@aol.com
href="mailto:BobDavis88@aol.com">BobDavis88@aol.com</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> Friday, January 24, 2003 =
12:58
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Yow-yow-yowing =
bass
strings</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 =
face=Arial size=2
FAMILY="SANSSERIF">Thanks to those who have responded so far about =
this. I
thought I'd better send an interim response, so you'd know I'm still
listening.<BR><BR>First, let me clarify what I know so far, and rule =
out a few
things. I agree with Ron that this is definitely not a voicing issue, =
nor a
termination issue. It's not in the leveling. It's not a leaky damper, =
nor an
undamped segment of another string. It's not in the hammer at all, or =
rather
in the angle of attack of the hammer (sorry Sarah, interesting post), =
since
the strings exhibit at least similar behavior when plucked; at least =
the
yowing ones still yow, and the clean ones are still clean. It seems to =
be in
the string itself, and consists of beats. What I really want to know =
is what
is beating against what, and while I really really really didn't want =
to
speculate, the hypothesis that seems most convincing to me so far was =
posted
by John Musselwhite:<BR><BR>"Would those problematic single bass =
strings have
LMFs [longitudinal mode frequencies] that are either unstable or out =
of tune
with the rest of the string?"<BR><BR>I have the CD from the Five =
Lectures, but
I can't lay my hands on it right now. However, my memory is while the
longitudinal modes produce different pitches, they are clear pitches, =
and not
beating (?) Still, beating suggests non-harmonic stuff beating with =
harmonic
stuff. <BR>-----<BR>Well, I took a look at Conklin's patent on =
longitudinal
mode design, and now I understand more than I wanted to. It looks as =
if the
longitudinal mode can be tuned by controlling the weight per unit =
length of
the wire, including core and loading, and falls roughly in the area =
four
octaves+ above the fundamental pitch of the string. I still =
don't know
for sure if this can beat with the partials produced by the normal =
flexural
modes, but I don't see why not, and if so, I don't understand how you =
could
reliably make bass strings ever, especially if they are so sensitive =
that the
same string on the same model can come out either wonderful or
hideous.<BR><BR>One of you scientists out there set us straight. I'm =
getting
interested in this, and I don't have time to be interested.<BR><BR>Bob =
Davis</FONT> </FONT></BLOCKQUOTE></BODY></HTML>