> >The reason Dr. Sanderson gave was that two strings moved in opposition > > reducing the movement of the bridge. He was able to measure the drop in > > pitch with his accutuner. The class could also hear the change in the beat > > rates when shown by Virgil. > >Greetings, > It has been shown that a flexible termination will allow that string to >behave as though it is longer than it really is, and a very rigid termination >will show the opposite, ie. two strings of equal diameter, length, and >tension will show two different frequencies if one has a rigid termination >point and the other a more flexible one. The reason for this is that the >flexible terminus allows the string to effectively "end" farther away, while >the rigid one requires that all of the energy rebound from a point that is, >on a microscopic scale, not quite at the terminus,itself. > This effect is made manifest when two strings are operating > simultaneously >on a bridge; if they move together, the bridge moves more. It is not the >"Weinreich" effect, but shares some of the same physics. The "Virgil" effect >depends on very closely matched unisons, and if there is cause to "detune" >one string to compensate for variables, I don't think the flattening will >show itself. >Regards, >Ed Foote RPT Ed, I never have liked the strings of a unison moving in opposition theory. I don't think that's even possible in a piano. Ron N
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