Does anyone know anything about that?
Was it tried out actually?
Ninjutsu in Graz: www.ninjutsu.at
> A long time ago I heard of the idea, that sound recording could
have > occured during the decoration process of pottery. The theory
was, that > the decoration tools worked like the needle on old
grammophones, and > this sounds could be recreated by laser scanning.
A highly dubious claim.
Consider the old gramophone recording apparatus, which consisted of a
tightly stretched membrane of some sort to which a needle was
attached. A wax cylinder, just in contact with the needle, was rotated
as you spoke. Your speech caused the membrane to vibrate, which in
turn caused the needle to dig into the wax, thus reproducing the
vibrations of the membrane.
Now imagine that instead of the tightly stretched membrane, you have
a loose floppy one. Then further imagine that this loose, floppy
membrane is made up of some thick jelly like substance. How many
vibrations are going to make it through to the needle?
That is the situation with this pottery business. Most of the shaping
was done with the bare hand. Where tools were used, they were held in
the hand - and it would take one heck of a loud noise to cause the
hand to vibrate!
Then consider the speed of the wheel's rotation and the circumference
of a pot. How long would it take for the pot to complete a single
rotation? Half a second, I should think, would be the absolute
maximum for useful work.
You would, therefore, need to have a sound that occurred precisely
during the last half second of work on the pot (because any sound
before that would be erased by the next turn of the pot). The chances
of anything meaningful being "recorded" are infinitesimally small -
and how would you sort out the half second of speech from the
background noise of the natural irregularities in the clay?
In short, even if it were possible that recording took place, it
would not be worthwhile attempting to recover it.
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vincent@triumf[munge].ca Pete Vincent
Disclaimer: all I know I learned from reading Usenet.