<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html>   Bernhard Stopper wrote: <blockquote TYPE=CITE>Ric, soundboard must not be able to vibrate longitudinally to reproduce longitudinal string movement cause the bridge responds to the longitudinal wave orthogonal and thus producing transversal movement on the soundboard. regards bernhard   <a href="https://www.moypiano.com/resources/#archives"></a> </blockquote> That seemed to be the reigning opinion last year as well... and tho I tried my best to look at the reaoning behind those who said otherwise... in the end I was swayed by fellows like Anders Askenfelt and the like... who aggree that the board vibrates primarilly transversely. Still.... there is something ...shall we say sexy ??? about the idea that some degree of longitudinal wave action is pumping through all that mass and playing some kind of role in the sound. And if a Professor from the University of Purdue who is studying exactly this subject matter is to be believed... then perhaps there is something to it afterall. Mind you... I'm hardly the physist enough to say which way or the other myself.... tho its sometimes easy enough to see when others are trying to blow bigger smoke rings then their skills allow for.... but thats another subject..... Either way... its an interesting subject and I have a feeling you would have been a valuable participant to that disscussion... which waged on for well 45 days. One of our better banterings here on Pianotech. To the irriatition of some... and to the fascination and enjoyment of many. btw Bernhard. Did you ever get an english version of your Mesurix program done ? I know several (including myself) who would love to purchase that. Cheers, and glad to see your name up here. I do hope you choose to stay around for a good long while. RicB -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway <A HREF="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</A> <A HREF="http://home.broadpark.no/~rbrekne/ricmain.html">http://home.broadpark.no/~rbrekne/ricmain.html</A> <A HREF="http://www.hf.uib.no/grieg/personer/cv_RB.html">http://www.hf.uib.no/grieg/personer/cv_RB.html</A>  </html>