Re: Pinhole Digest #1293 - 08/28/03

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From: Jeff Furman (jfurman@ocs.net)
Date: Thu Aug 28 2003 - 12:30:46 PDT 

Date: Thu, 28 Aug 2003 12:30:46 -0700 (PDT)
From: Jeff Furman <jfurman@ocs.net>
Subject: Re: Pinhole Digest #1293 - 08/28/03
Message-ID: <Pine.LNX.4.21.0308281229150.8963-100000@ocs.net>

From: "Pinhole Listserv" <pinhole@exploratorium.edu>
To: "Jeff Furman" <jfurman@cisco.com>
Subject: Re: Adam Singer's gadget is a cloud chamber
Date: Thu, 28 Aug 2003 12:25:22 -0700
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>This is a static (versus an expansion) type cloud chamber. It looks like
>dry ice goes in the wooden box underneath the bottom metal plate, and an
>alcohol or alcohol-water mixture saturates the felt pad in the top. The
>side hole in the plastic cylinder is intended to support a radium alpha
>source on a pinhead stuck into a small cork. Use a plain cork to cover
>the hole in order to see just cosmic rays and environmental radiation if
>a radium source is unavailable (or illegal these days?) You need a light
>source, such as a slide projector, to illuminate the tracks from the
>side. I can guess the wires on the top plate are an electric heater used
>to maintain the proper temperature gradient inside the chamber and keep
>the alcohol vapor releasing from the felt pad.
>This seems to be a somewhat more elaborate example of the typical
>demonstration device.
>
>Jeff Furman
>
>
~

On Thu, 28 Aug 2003, Pinhole Listserv wrote:
> Subject: Show and tell
> From: "emuller" <emuller@exploratorium.edu>
> Date: Wed, 27 Aug 2003 23:18:58 -0700
>
> Pinholers,
>
> We have a new piece of mystery equipment to be identified.
> Please help our alumni figure out what this thing is.
> It can be view at:
>
> http://www.exploratorium.edu/ti/alumni/show_and_tell/
> It is in the alumni area, so use your "teacher" "institute" pass codes.
>
> Thanks,
>
>
> Eric Muller
> Science Educator
> Exploratorium Teacher Institute
> 3601 Lyon St.
> San Francisco, CA 94123
> 415 561 0386

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