<!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 6.00.2800.1226" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: =
#ffffff"
bgColor=#ffffff>
<DIV><FONT face="Comic Sans MS" color=#000080 =
size=3></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=Erwinspiano@aol.com
href="mailto:Erwinspiano@aol.com">Erwinspiano@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> January 02, 2004 2:20 =
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: No downbearing =
?</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>In a message dated 1/2/2004 11:51:20 AM Pacific Standard Time, <A =
href="mailto:pianobuilders@olynet.com">pianobuilders@olynet.com</A>
writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px =
solid">
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"><FONT
face="Times New Roman" color=#000040> <FONT =
size=4> I
wonder if it was common practice to press boards on a flat deck =
which is
what I've always heard.(I forget where) Perhaps no one really =
knows
but even if they were pressed in a dished caul with ribs that
long & usually not very tall how much crown could the =
panel
really retain over time. I recently saw 1920 ish Knabe =
upright with
very tall ribs & enough of them. I didn't check the =
crown at that
time but I will when next I see it. This piano was very well
preserved ,great sound. Thanks for the
replies.</FONT></FONT></BLOCKQUOTE></BLOCKQUOTE></DIV>
<DIV><FONT face="Times New Roman" color=#000040 =
size=4>
Dale</FONT></DIV>
<DIV><FONT face="Times New Roman" color=#000040
size=4></FONT> </DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=3>From what little
I've been able to piece together in talking with some old bellymen both =
were
common. The dished caul was introduced along with the crowned rib but =
was often
used with flat ribs in the misunderstood hope that this would somehow =
reduce the
stress on the panel. </FONT></DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=3></FONT> </DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 size=3>In =
general
relatively low, wide ribs are used with compression-crowned soundboard =
systems
(they must be flexible enough for the expanding panel to force a crown) =
and
taller ribs are used with rib-crowned systems (they must be stiff enough =
to
support crown). At the risk of stirring up once again The Great =
Soundboard
Debates of 2003, ribs do not support crown in a compression-crowned =
system. They
must be relatively flexible. The last Knabe upright I was involved with =
had
crowned ribs.</FONT></DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=3></FONT> </DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080
size=3>Del</FONT></DIV></BODY></HTML>