<!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 bgColor=#ffffff> <DIV> </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=Richard.Brekne@grieg.uib.no href="mailto:Richard.Brekne@grieg.uib.no">Richard Brekne</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 2:49 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: soundboard = stresses</DIV> <DIV><BR></DIV>   <P>  </P>I just noticed there was a reference to tension along = the grain that more or less says, we dont really have reliable data because = measurement is rather difficult and demand for the information is too small to = justify it. So it would seem difficult to make many conclusions about tension with = the grain. </BLOCKQUOTE> <P dir=ltr><FONT face="Comic Sans MS" color=#000080>The tensile = strength for green Sitka spruce is 8,600 lb/in2. It is about 13% higher at 12% MC. Remembering, of course, that this is an average of several samples. And = don't forget to degrade this figure by about 40% if you intend to hang from it = for more than a week or two.</FONT> <P dir=ltr><FONT face="Comic Sans MS" color=#000080>See the notes = about this in the Wood Handbook. Chapter 4.</FONT> <P dir=ltr>Del</P></BODY></HTML>