<!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> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #800080 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=rbrekne@broadpark.no = href="mailto:rbrekne@broadpark.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> June 17, 2001 1:20 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Soundboard = Evaluation</DIV> <DIV><BR></DIV>  <P>Delwin D Fandrich wrote: <BLOCKQUOTE TYPE="CITE"> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #800080 2px solid; MARGIN-RIGHT: 0px"> <DIV dir=ltr>Does this mean that the a compression soundboard = assembly can hold crown as  long as RH is held at high enough levels to = sustain internal compression ? Or do you mean to say that the assembly = fail anyways...perhaps more slowly.?</DIV></BLOCKQUOTE> <DIV dir=ltr><FONT color=#800080><FONT size=-1>No. Go to R. = Bruce Hoadly's 'Understanding Wood' and study the effect of creep and = compression-set. Wood fibers that are under compression--regardless of the degree of compression--will continue to go through compression-set. This takes = place faster when the compression levels are higher and more slowly when = the compression levels are lower.</FONT></FONT> <P><FONT color=#000000>Well then what exactly do you mean = by</FONT> <P>"This is climate dependent to the degree that during dry periods = moisture will be drawn from the wood fibers and the panel's internal = compression will decrease. During humid  periods the wood fibers will absorb = moisture, try to swell, and the panel's internal compression will increase." <P>? <HR> </P></DIV></BLOCKQUOTE></BLOCKQUOTE> <DIV dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #800080 2px solid; MARGIN-RIGHT: 0px"><FONT color=#800080 size=2>Just what I said. During periods of high = humidity internal compression will be greater than during periods of low humidity. But = nothing lasts forever. It will fail anyway. But not necessarily slowly. When = internal compression levels are high, compression-set is taking place faster than = it does when compression levels are low.</FONT></DIV> <DIV dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #800080 2px solid; MARGIN-RIGHT: 0px"><FONT color=#800080 size=2></FONT> </DIV> <DIV dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #800080 2px solid; MARGIN-RIGHT: 0px"><FONT color=#800080 size=2>Del</FONT></DIV></BODY></HTML>