>You are asking the list and me to accept that a variation in tension >of a few pounds at most due to the trasverse vibrations of two >strings is sufficient to cause a rocking of a long bridge firmly >glued to a soundboard and held in position at its top by over ten >tons force? You'd have the bridge in smithereens before you could >rock it with a crowbar let alone such a minute force. At what point does a movement become small enough to not exist? >> >I say that the sound emitted from the soundboard will be practically >>>identical whether the two strings (according to your theories) are >>>acting in concert to move the soundboard in one direction or whether >>>they are counteracting each other and therefore quite unable to >>>produce any movement. >>> >>>Answer me that. >>> >>>JD >> >>If the strings moving in opposition could be kept exactly out of phase, >>that could very well be correct for the reasons I gave above. > >It will be correct with or without any of your impossible hypotheses. >It happens all the time when a piano is played. The net force >exerted by the strings that might tend to move the bridge in any >direction is on average zero. This would mean that by the laws of >probability there would frequently occur a zero force and, according >to you, total silence. Very embarrassing for the sensitive pianist! > >JD No, I was agreeing that the piano would still sound for the reasons I gave above. Why would I say that the bridge would move but the piano wouldn't sound? Ron N
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