<HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META http-equiv=Content-Type content="text/html; charset=windows-1251"> <META content="MSHTML 6.00.5730.11" name=GENERATOR></HEAD> <BODY> <P> <DIV>RicB said: " <DIV><FONT size=+0>I am not sure myself what mass coefficient is to be used with Pure </FONT></DIV> <DIV><FONT size=+0>sound. I've been asking questions along those lines here and on CAUT for </FONT></DIV> <DIV><FONT size=+0>about a month now and havent gotten any response. I do know his density </FONT></DIV> <DIV><FONT size=+0>and E-modulus figures. Perhaps the following paragraph from his website </FONT></DIV> <DIV><FONT size=+0>will help...</FONT></DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0>Providing wire numbers can be found on the instrument, it is</FONT></DIV> <DIV><FONT size=+0>usually possible to establish the brand of pianowire used, by</FONT></DIV> <DIV><FONT size=+0>calculating the string tensions assuming one type of pianowire,</FONT></DIV> <DIV><FONT size=+0>then look at the logic of the graph that comes out. It is</FONT></DIV> <DIV><FONT size=+0>precisely the huge difference between the various numbering</FONT></DIV> <DIV><FONT size=+0>systems that often set out one particular brand.</FONT></DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0>To measure a string tension I use a simplificated form derived</FONT></DIV> <DIV><FONT size=+0>from the Taylor formula:</FONT></DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0>F = 2514 x f2 x l2 x d2</FONT></DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0>F = tension in kg (gravity 9.81).</FONT></DIV> <DIV><FONT size=+0>f = frequency in Herz.</FONT></DIV> <DIV><FONT size=+0>l = speaking length in meters.</FONT></DIV> <DIV><FONT size=+0>d = diameter in meters (!)</FONT></DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0>This formula is based on modern piano wire, average density 7,85.</FONT></DIV> <DIV><FONT size=+0>These data are all hidden within the number: 2514.</FONT></DIV> <DIV><FONT size=+0>For Pure Sound wire this number is : 2530. (average density: 7,90)</FONT></DIV> <DIV><FONT size=+0>For Malcolm Rose's wire the number is : 2488. (average density:</FONT></DIV> <DIV><FONT size=+0>7,769)"</FONT></DIV> <DIV><FONT size=+0></FONT> </DIV> <DIV><FONT size=+0>Ric,</FONT></DIV> <DIV><FONT size=3>I read through all of that and finally got to the 2nd from the bottom line- - -Voila': it reads average density 7.90!! That's the mass coefficient and has to be plugged into the scaling formula to get a better picture of what that stuff is all about and how it will react in regards to tension and Inharmonicity and Impedance! If you didn't do that then whatever you are planning on this piano needs to be re-calced, IMO.<G>  :-(</FONT></DIV></DIV> <DIV>Best Regards,</DIV> <DIV> </DIV> <DIV>Joe Garrett, R.P.T.</DIV> <DIV>Captain of the Tool Police</DIV> <DIV>Squares R I</DIV> <DIV> </DIV> <P></P></BODY></HTML>