<!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 6.00.2800.1264" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: =
#ffffff"
bgColor=#ffffff>
<DIV><FONT color=#000040 size=4>"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."</FONT></DIV>
<DIV><FONT color=#800000 size=3></FONT> </DIV>
<DIV><FONT color=#800000 size=3>I kept a rib from an 1890s Knabe =
upright that I
disposed of. I couldn't find it just now, but I know it had quite a bit =
of crown
in it - clearly in excess of a 60-foot radius.</FONT></DIV>
<DIV><FONT color=#800000 size=3></FONT> </DIV>
<DIV><FONT color=#800000 size=3>Terry Farrell</FONT></DIV>
<BLOCKQUOTE dir=ltr
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=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> Friday, January 02, 2004 =
5:20
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">
<DIV><FONT face="Times New Roman" color=#000040><FONT =
size=3><STRONG>I
have no doubts</STRONG></FONT> <STRONG><FONT size=3>that there =
was some
sort drying prior to ribbing but with the uprights a =
mere few
hours of heating isn't really going to take a soundboard panel to =
an
adequately low emc level for compression crowning. None of us =
would expect
that result in our own shops. </FONT></STRONG></FONT></DIV>
<DIV><FONT face="Times New Roman" color=#000040><STRONG><FONT
size=3> I suspect any amount of crown achieved =
was mostly
dependent on circumstance I.E. it was a cold dry time of year =
&
the pre ribbed boards were already at low emcs.
</FONT></STRONG></FONT></DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=3>Few of us run
soundboard conditioning rooms at anything like the temperatures used =
by
these early pianomakers. We certainly don't. You put a batch of =
already
reasonably dry and properly stickered soundboard panels in a room =
running
well upwards 120º+ and they are going to shrink quite nicely =
overnight. All
you need to do is get them down to 4%. Standard practice, I'm
afraid.</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></BLOCKQUOTE></DIV>
<DIV><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></DIV>
<DIV><FONT face="Times New Roman" color=#000040 =
size=4>
Dale</FONT></DIV></BLOCKQUOTE></BODY></HTML>