<!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> <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=davidlovepianos@earthlink.net href="mailto:davidlovepianos@earthlink.net">David Love</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> February 10, 2002 11:14 = AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Soundboard springs and = hysterisis: question for Del F.</DIV> <DIV><BR></DIV> <DIV><FONT size=2>Del:</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>Been reading the past posts on soundboard springs = and have come to your comments that a leaf spring arrangement would be subject = to "hysterisis" and would not be as effective.  Could you define = what you mean by that term as it applies here?</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>Thanks</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>David love</FONT></DIV></BLOCKQUOTE> <DIV dir=ltr><FONT size=2></FONT> </DIV> <DIV dir=ltr><FONT size=2> <DIV><FONT color=#000080>Did I say that? Surely not. </FONT></DIV> <DIV><FONT color=#000080></FONT> </DIV> <DIV><FONT color=#000080>Hysteresis would only be a problem if leaf = springs of multiple layers were used. Then the breakaway friction between the = various leaves might cause a response problem. (Bearing in mind that I've not = actually tried this.) Otherwise, with a single leaf, I don't see the = problem. And I can't think of any reason to use a multiple leaf spring arrangement for = this application. Using a single leaf spring it should be relatively easy to = figure out a virtually frictionless coupling between a leaf spring and the = soundboard. Assuming, of course, that one really wanted to use a leaf = spring.</FONT></DIV> <DIV><FONT color=#000080></FONT> </DIV> <DIV><FONT color=#000080>Del</FONT></DIV></FONT></DIV></BODY></HTML>