Phillip Ford wrote: > > I dont know Phil, but it seems fairly intuitive that a pulse, or wave... or > >however you want to conceptualize it... traveling down a wire and hitting an > >end point is going to tend to get deflected by the condition of that endpoint. > >If its angled as the bridge pins are, it would seem reasonable to assume that > >there will be some degree of force exerted on the vibrating string on that > >angle.. How much is another matter altogether... but its rather hard to > >disregard the data Wapin has assembled on the subject. > > > >I was under the impression that Wapins bridge was conducive to > >vibration in the > >vertical direction, not horizontal. If Rons statement is true, then the whole > >thing becomes just that more interesting... and as I said a bit back... it > >would be nice to see the same kind of frequency data on the Stuart as is > >available for the Wapin for comparison > > > >RicB > > Before we get too far down the rabbit hole may I say that the only > point that I was trying to make is that it is not possible (according > to my interpretation of the physics) to confine the string vibration > to a single plane. As to whether these two practitioners are in fact > making that claim I offer this: > Grin.. hey I can buy the absolutist objection.. but then I said "to some degree", and left wide open the question of how much. Seems to me the very obvious fact that the vertical bridge pin and the standard bridge pin each yeild different measuable output results point to a clear difference in string vibrational behavoiur... just what that is, is another matter of course.. but once that difference is established.. I see no reason to doubt that some increased tendancy to vibrate in a horizontal direction has some significant role to play..... you have a good reason why it shouldnt ?? > > From the Stuart website - 'The challenge of applying contemporary > design and technology to the evolution of the piano inspired the > invention of the bridge agraffe. This sophisticated string coupling > device is designed to retain the vertical mode of vibration produced > when the hammer strikes the string'. > > Leaving aside the preposterous claim that he invented the bridge > agraffe (perhaps he means that he invented his particular version of > a bridge agraffe), I read this as saying he believes his system > causes the string to vibrate only in a vertical plane. I dont think he claims to have invented the bridge agraffe.... I would think he claims to have invented a bridge agraffe at all...it is this particular one.. which he would then claim is significantly diffferent functionally from previous ones... Perhaps he is not being perposterous at all ?? Maybe we should...er... ask him ?? <g> > > > From the Wapin patent (6,100,457) - 'Although the nature of the > mechanical coupling between the strings, bridge structures and > soundboard and its influence on tone > quality is not fully understood, and not intending to be bound by any > particular theory herein.... > > So, as I read this the Wapin folks are not claiming to confine the > string vibration strictly to the horizontal plane. Actually, > compared to the outlandish claims one often sees in patents and the > know-it-all 'this is the way things work' attitude that often obtains > in discussions about pianos, their patent is refreshingly restrained. > Come on Phil... you going to compare a patent documentation to a commerical web site for a BS quotient ?? Grin... now THATS a fair shake if I ever saw one :) :) Cheers RicB > > Comments about Wapin in a separate post. > > Regards, > > Phil Ford > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html http://www.hf.uib.no/grieg/personer/cv_RB.html
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