Kay -

I found the following link of John Lahr working with slinkies in 2002, =
but it also talks about torsional waves.  I don't know if you have seen =
this link or not.  Its possible that the movie is a follow-on to the =
message that he was conveying.

=
http://www.exo.net/~pauld/summer_institute/summer_day10waves/wavetypes.htm=
l

Cheers,=20

Bob Hancock



On Sep 8, 2010, at 3:57 PM, Kay Wyatt wrote:

> Dear friends,
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> John Lahr's wife, Jan, gave me much of John's earthscience activities =
and experiements.  I'm familiar with most of them, but there is one in =
particular that I could use some help on.  I have posted some pictures =
at http://www.oregonshakes.com/temp/Lahr/ for your review.
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> The device appears to be a torsion wave generator but I'm not familiar =
with torsion waves generated by earthquakes (which was John's primary =
focus). Could this be something else related to earthquakes?
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> Be sure to look at the move link on the website so that you can see it =
in action.
> http://www.oregonshakes.com/temp/Lahr/MOV04260a.MPG
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> If any of you have ideas, please let me know.
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> Thanks so much,
> Kay Wyatt
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>=20
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