Date: Wed, 11 Jun 1997 03:11:53 -0400
From: Joe Dunfee <jdunfee-AT-shadow.net>
Subject: Re: Overhead Projector- Liquid Dynamics


>ISSUE: I am very intrigued with the graceful flow of the Earth's atmosphere
>and oceans. I am trying to recreate these fluid archetypal forms, the swirls
>of the clouds from the weather man's satellite,...  By syringing in colored 
>water (from the side) into still water I can alsost achieve the aesthetic
>forms I want but, they are too fast.  The gracefulness will come if I can
>SLOW this movement down.
> 
>PROBLEM: Is there a super slow moving (ie. thick) liquid that is still transpa
>rent enough to use on the overhead projector?  Are there other liquids that
>will not mix therefore achieving the desired "stick to themselves" look,
>besides oil and water?

  I really don't think you are going to find a solution using liquids for
the effect. The problem is that the fluid must also maintain momentum to
keep swirling. As soon as you get anything thicker than water, that
momentium is going to be greatly reduced and the liquid will very quickly
stop moving at all. 

  Perhaps a solution is to achieve it by a totally different means. You can
use a computer LCD projctor on an overhead and play back a moving image of
the swirling you want. Actually, you could use any projection source to
project the swirling you want directly onto the screen and the separately
project the shadow puppet images onto the same screen. Unfortunately neither
of these ideas are cheap.

  The easiest solution may be to just accept the effect that you get from
the water.

Joe Dunfee
Miami, Florida USA



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