>> >> From: Ron Nossaman <nossaman@southwind.net> > >> >> If there were a super lubricant that got you zero friction >between >> >the strings and pins, >> > When struck, the pitch would vary wildly as the >> >string rendered back and forth freely through the pins. >> >Granted there is no zero friction execpt in the imaginary. So in >> >reality does the pitch vary less wildly as the string renders >less >> >freely through the pins according to how much friction is present? > >> >R Moody . >> Yep. Given a well tuned, stabile piano. I've noticed on some >instruments, a heavy blow will knock a string slightly flat. >Following up with a lot of light to medium blows, the string will >creep back up to pitch! I'm assuming the now overtensioned tail sec. > Ron Nossaman > > > >Sure a heavy blow can knock a string flat, the same way a heavy blow >can knock a string sharp. Only because the tensions behind the >friction points were not equal. That is why it is hard to imagine a >string once knocked flat could be knocked back up to pitch, or even >knocked up at all. But that is not what Susan's suggestion is about. > >So to ask the question directly, explain please? If there were zero >friction, "When struck, the pitch would vary wildly as the string >rendered back and forth freely through the pins." > If that is the case, the amount of variance should be be both >detected and measured, and then predicted. Explanations should also >answer other questions, .ie Would there be less pitch variance with >a softer blow? What happens to the pitch when the string looses >energy? For the pitch to vary wildly, the tension would have to vary >wildly, since its length and mass are not changing. Or does "moving >back and forth freely" mean the length is also varying? > >Richard Moody > Actually, in the never-land of ZERO friction, the pitch wouldn't vary at all, since the tension of all segments would remain identical. Or so it seems to me. {{ :--> ) Susan Susan Kline skline@proaxis.com P.O. Box 1651, Philomath, OR 97370 Variables won't; constants aren't.
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