<HTML><HEAD> <META charset=UTF-8 http-equiv=Content-Type content="text/html; charse= t=UTF-8"> <META content="MSHTML 6.00.2800.1106" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #fffff= f"> <DIV> <DIV>In a message dated 12/18/2005 4:15:04 PM Eastern Standard Time, robert.= scott@tunelab-world.com writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue = 2px solid"><FONT face=Arial>Ric, it's not magic.  When struck, the st= ring starts out vibrating only in the up and down direction.  But it qu= ickly precesses into an elliptical path, as described by Peter Weinbreck's a= rticles in the 1970’s, and perhaps even earlier.  Since the str= ing is vibrating both up-and-down and right-and-left, the termination point = must be viewed separately in both axes.  If the termination point is th= e same for all directions of vibration, then all is well, and every vibratio= n is at the same pitch.  But if the termination point for up-and-down m= otion is different than the termination point for right-and-left motion, the= n these two motions will occur at different pitches, hence the false beat be= tween them.  When a bridge pin is loose, it does not resist right-and-l= eft motion as well as the bridge cap resists up-and-down motion.  There= fore the right-and-left vibration effective speaking length is slightly long= er than the up-and-down effective speaking length.  This is consistent = w!<BR>ith the  <BR>observations of performing the screwdriver test for = loose pins.<BR><BR>Robert Scott<BR>Ypsilanti, Michigan<BR>__________________= _____________________________</FONT></BLOCKQUOTE></DIV> <DIV>Greetings,</DIV> <DIV> </DIV> <DIV>        This explaination is excelle= nt!  Thank you!</DIV> <DIV> </DIV> <DIV>Happy Holidays</DIV> <DIV>Julie Gottshall,</DIV> <DIV>Reading, PA</DIV></BODY></HTML>