Date: Fri, 18 Feb 2005 10:56:43 -0500

Author: Michael Timmins

Subject: Re: electroscope

Post:

Oh yeah,
Here is the link to aforementioned picture:

http://demolab.phys.virginia.edu/demos/misc/electrometer.jpg

On Friday 18 February 2005 08:30 am, Wolfgang Rueckner wrote:
> Sounds like a neat electroscope, Sam. What are these "straws" actually
> used for in HEP? -- Wolfgang
>
> On Feb 17, 2005, at 4:40 PM, sampere wrote:
> > I just made a pretty neat electroscope that's visible and works
> > incredible well. I stumbled across this straw material in the shop
> > last week on one of the benches. I ask a few questions and find out
> > it's conductive, so I take a piece. I cut some aluminum sheet with
> > some shears and punch a few holes and fabricate essentially a Braun
> > electroscope in all of about 5 minutes. The straw is shiny and about
> > 1/4" OD, so it's pretty visible all by itself, but glue a couple mylar
> > flags at each end and the thing is very visible! The straws are 7
> > micron thick kapton walls coated on the inside and outside with a
> > copper film and weighs next to nothing. A stainless steel pin is the
> > pivot. The lengh of this straw is about 15", so even small angular
> > deflections are easily seen.
> >
> > I used it today for the parallel plate capacitor demo - worked great.
> > No more gold leaf electroscopes!
> >
> > Depending on what happens to federal spending on HEP dictates whether
> > we'll have tons of this stuff around or not. If we eventually get
> > tons, I'll share, in the meantime, go snooping around your HEP labs.
> >
> > Sam

--
Mike Timmins
University of Virginia
Acadamic Support Supervisor

email: mat3q@virginia.edu
phone: (434) 924-6800
mail address:
382 McCormick Rd
Charlottesville, VA 22904
From David.Kardelis@ceu.edu Fri Feb 18 11:09:26 2005

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