Re: A Request, or Two...

Wm Perry ( (no email) )
Thu, 28 Jan 1999 23:03:33 -1000

Don't remember the date, but the place was the Tacoma Narrows bridge locates
in Washington State. From what I have heard about the bridge, it collapsed
under its own vibrations when the wind would blow through the canyon it was
crossing over. Engineers, after rebuilding it several times, deduced what
was going on and changed some of the materials in the bridge, changing the
mass and altering the resonance of the bridge. That is how I understood it
anyway.
BillP
-----Original Message-----
From: Ted Gallop <gallope@planet.curtin.edu.au>
To: keelynet@DallasTexas.net <keelynet@DallasTexas.net>
Date: Thursday, January 28, 1999 9:16 PM
Subject: A Request, or Two...

>Hello Members,
>
>I'm new to this group, and hope to be able to contribute constructively as
>time goes by...
>My particular interest, at the moment, is sound/accoustics/harmonics, etc.
>
>Can anyone help me with the following two requests.
>
>I've read all of the keelyNet files on Ed Leedskalnin. However I was under
>the impression he had written quite a bit about his "sweet 16". Are there
>any copies of this writing extant? If so, where can I get my hands (eyes?)
>on it.
>
>Also, I have seen over the last few decades an occasional film clip of a
>suspension bridge (somewhere in the USA I think) swinging and swaying and
>twisting, and eventually disintegrating in high winds - the usual
>explanation being that its 'natural frequency of vibration was in tune with
>that caused by the wind' or something like that. Does anyone know the date
>and place, and how I could get some of the footage (avi format?)
>
>Many thanks.
>
>Ted Gallop
>
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