From: pauld@exploratorium.edu
Date: Fri Nov 21 2003 - 08:59:46 PST
Message-ID: <1507.209.239.173.234.1069433986.squirrel@www.exo.net> Date: Fri, 21 Nov 2003 08:59:46 -0800 (PST) Subject: Re: pinhole science snacks From: pauld@exploratorium.edu
Hi Shelley
The name of the pendulum exhibit is "Pendulum Snake"
Lori has a write up on how to build it.
Your hand looks "dry" in the tank.
It looks wet when it is covered in water while in air because the layer of
water reflects light from the air-water surface. The air water surface is
just a short distance from your flesh.
In the tank the water "layer" around your hand is really thick so there is
no light reflection near your skin so it looks dry.
Paul D
>
> Hi pinholers,
>
> My 7th grade students are preparing to work on our second annual
> mini-Exploratorium, and we were looking for snack writeups for a couple of
> exhibits they want to duplicate. One group that wants to do the one with
> a
> series of pendulums of different lengths, with a board that keeps them
> even
> until it's lowered, but I'm not sure they remember it right. Another
> group
> wants to reproduce the tank of water with the mirrors under it. They
> asked
> me why it looks like your hands are dry in the mirror, but I really don't
> know
> how to explain it.
>
>
>
> --- Shelley Collier
>
> --- scoll858@earthlink.net
>
>
>
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