Date: Mon, 21 Feb 2005 11:30:38 -0500

Author: "Thomas O'Neill"

Subject: RE: electroscope


As a consumer of Mike Timmin's electroscopes, I would like to offer a
testimonial that they hold very well under the ritual abuse found when
working with both middle school and high school students. I have three
and would gladly trade my gold-leaf electroscopes for more.


Thomas O'Neill
Shenandoah Valley Governor's School

-----Original Message-----
From: sampere []
Sent: Thursday, February 17, 2005 4:40 PM
Subject: electroscope

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.


From Mon Feb 21 11:36:05 2005