Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!pt.cs.cmu.edu!cadre.dsl.pitt.edu!pitt!unix.cis.pitt.edu!yahoo
From: yahoo@unix.cis.pitt.edu (Kenneth L Moore)
Newsgroups: sci.electronics
Subject: Re: Undesired radio reception: mechanism?
Message-ID: <20640@unix.cis.pitt.edu>
Date: 15 Nov 89 01:58:57 GMT
References: <19422@pasteur.Berkeley.EDU> <1044@umigw.MIAMI.EDU> <1989Nov13.191239.25082@sj.ate.slb.com>
Reply-To: yahoo@unix.cis.pitt.edu (Kenneth L Moore)
Distribution: usa
Organization: Univ. of Pittsburgh, Comp & Info Services
Lines: 19

In article <1989Nov13.191239.25082@sj.ate.slb.com> greg@sj.ate.slb.com (Greg Wageman) writes:
>Opinions expressed are the responsibility of the author.
>
>In article <1044@umigw.MIAMI.EDU> wb8foz@Mthvax.Miami.Edu (David Lesher) writes:

>Why does that pulsing DC in the tin roof make it vibrate?  I am
>familiar with the piezoelectric effect, but how many common materials
>actually exhibit it?
>
>Copyright 1989 Greg Wageman	DOMAIN: greg@sj.ate.slb.com

I am a retired steel worker and have seen a coil of very heavy wire
(50-60 lbs) attached to a welding electrode jump every time the welder
drew an arc. In this case I think that the explaination is that the coil
of wire created an electromagnet which interacted with the current
flowing to the electrode. I don't know about flat plates of tin.

-- 
                 yahoo@unix.cis.pitt.edu (Kenneth L Moore)