Re: [Phys-L] --EXTERNAL-- Graphite resistivity

["Lulai, Paul" <plulai@stanthony.k12.mn.us>]

Larry,
Thanks for the help.
I picked up some soft pencil leads and will give it a shot again this
coming week.
Have a good one.
Paul.
On Mar 4, 2016 5:02 PM, "Woolf, Lawrence" <Lawrence.Woolf@ga-asi.com> wrote:

> Hi Paul-
>
> That was the Line of Resistance workshop presentation that I gave (along
> with 2 others) at that AAPT meeting.
>
> It was further developed in conjunction with the Institute for Chemical
> Education at the U. of Wisconsin, and the kit is still sold:
> http://ice.chem.wisc.edu/Catalog/SciKits.html#Anchor-Line-52
>
> Some extensions and other presentations that were developed after that are
> at:
>
>
> http://www.sci-ed-ga.org/Websites/gasef/images/pdf/Line_of_Resistance_Addenda.pdf
>
>
> http://www.sci-ed-ga.org/websites/gasef/images/pdf/APS%202005%20March%20Teachers%20Day%20Line%20of%20Resistance.ppt
>
> Graphite pencils from an art store such as Aaron Brothers work well as to
> do many other soft pencils.  The best bet is just to buy a bunch of
> different pencils and test them out.  Graphite pencils are often better
> than regular pencils because the regular pencils use other non-conductive
> fillers (clay) in them.
>
> Larry Woolf
>
>
> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@www.phys-l.org] On Behalf Of Lulai,
> Paul
> Sent: Friday, March 04, 2016 1:23 PM
> To: Phys-L@phys-l.org
> Subject: --EXTERNAL--[Phys-L] Graphite resistivity
>
> Hello.
> I am getting ready to do a resistivity lab that I've done for a decade but
> I ran into a problem. The art pencils that I've been using are gone. They
> apparently vaporized along with my packet of materials from an old aapt
> workshop a decade or more ago.
> I remember that art pencils were better because...
> I don't remember...
> I am tempted to pick up softer leaded pencils so the lead would get into
> the cracks of the paper.
> Does anyone have a quick recommendation?
> Thanks for your help.
> Paul.
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