<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE></TITLE> <META http-equiv=Content-Type content=text/html;charset=ISO-8859-1> <META content="MSHTML 6.00.2900.2963" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY text=#000000 bgColor=#ffffff> <DIV><FONT size=2>You can see some of Dr. Birkett's high-speed videos here (note you may need a special plugin for it to work):</FONT></DIV> <DIV><FONT size=2><A href="http://real.uwaterloo.ca/~sbirkett/high%20speed%20imaging.htm">http://real.uwaterloo.ca/~sbirkett/high%20speed%20imaging.htm</A></FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>--Cy--</FONT></DIV> <BLOCKQUOTE 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=ricbrek@broadpark.no href="mailto:ricbrek@broadpark.no">Ric 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> Monday, August 14, 2006 3:11 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Wapin Revisted</DIV> <DIV><BR></DIV> If you have a gander at the following page :     <A class=moz-txt-link-freetext href="http://www.kettering.edu/~drussell/Demos/reflect/reflect.html">http://www.kettering.edu/~drussell/Demos/reflect/reflect.html</A> , neither the absolute soft or hard examples seem to fit... rather something inbetween seems to happen.  Of course one would have to examine the high speed photography much closer to be sure.. but it appeared convincingly enough to me that the reflected pulse highest amplitude did not go below the origional string line until the pulse had traveled quite a ways back across the string. </BLOCKQUOTE></BODY></HTML>