[Phys-L] Re: Looking for electricity demo apparatus

[Karl Trappe <trappe@PHYSICS.UTEXAS.EDU>]

John:  I've emailed Cliff for the location of the article (or you
can).  His email address is: "Cliff Bettis" <cbettis@unlserve.unl.edu>

Cliff hangs out on tap-l where the physics lecture demo group (PIRA
gang) hangs out.  I will also post a few old postings from tap-l,
with apologies to those who have already read them.  A lot of the
concern is over stray radiation from the old cathode ray tubes,
especially when excited by the spark coil, such as the one that
Leybold used to sell.  It is supposed to be sold with a lead crystal
shield, if I recall. Karl

> On 03/17/05 11:35, Karl Trappe wrote:
> >  Check with Cliff Bettis at Nebraska.  He wrote an article
>
> Like where, man?
>
> I got no relevant hits from
>    http://www.google.com/search?q=bettis+spark-coil
>
> >  on spark
> >  coil radiation that's enough to scare your pants off!  He was the
> >  radiation safety officer for his department, and had to ban his own
> >  lecture demo apparatus.
>
> Did he actually measure it?  I'm surprised, unless there's
> a pretty decent vacuum involved.  I would have thought the
> V=IR drop would greatly de-energize the electrons as they
> go through the air.
>
> >  I think the high frequency nature of the hand
> >  held tesla gets around the danger.
>
> What's the mechanism whereby frequency affects this sort
> of Xray production?


--
> Dr. Karl I. Trappe, outreach consultant      Home (512) 264-1616
> Research Scientist Associate V (retired)
> Senior Lecturer in Physics (retired)
> Physics Department, Mail Stop C-1600
> The University of Texas at Austin
   Austin, Texas 78712-1081
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