Re: pinhole Parabola or hyperbola

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Thu Jan 08 2004 - 08:53:02 PST 

Message-Id: <l03110730bc233b460857@[192.168.111.197]>
Date: Thu, 8 Jan 2004 08:53:02 -0800
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole Parabola or hyperbola

Hi Mark

It's a hyperbola.

We have the instructions on how to build iit in I.

I'll mail them out to you soon.

Paul D

>Hi Pinholers,
>
>When I did the TI a few summers ago there was an exhibit or snack of a stick
>being rotated in such a way that it could pass through a hyperbolic or
>parabolic slot (don't remember which). I am looking for the directions to
>build this snack but can't find it on the web. Any info would be helpful.
>
>Thank you
>Mark Lawton
>
>
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