Date: Fri, 30 Sep 2005 15:35:39 -0400

Author: Stephen Irons

Subject: Re: Time Reversal


Hi All,

We just ran it with much success. We use Karo syrup as the newtonian
liquid and for dye we mix food coloring into a small amount of the
syrup. We then inject it into the Couette cylinder. We just put some
video of it on our demo web site. You can view it at the following link:

Over time, we see some diffusion of the dye (probably due to the
liquid in which the food coloring is suspended), but on the scale of
the demo, it is not a problem.

Hope this helps.


Stephen Irons
Yale University
Director, Instructional Laboratories Department of
tel: 203-432-3664
P.O. Box 208120
fax: 203-432-6175 New
Haven, CT 06520-8120

Yale University
Department of Physics
217 Prospect Street
New Haven, CT 06520

On Sep 30, 2005, at 1:23 PM, Zigmund J. Peacock wrote:

> Taplers, I just did the "time reversal demo" it went well in fact I
> got a good round of applause.
> The question I have of you who do this, what do you use to dye
> the glycerin?
> I used food coloring which is OK ,but do any of you use a dry
> powder dye?
> If so what? Zig
> --
> Zigmund J. Peacock University of Utah/
> Physics
> 115 SOUTH 1400 EAST #201 Tel 801 581
> 6602 SALT LAKE CITY UT 84112-0830 Fax 801
> 581 4801
> "We sleep safely in our beds because rough men stand ready in
> the night to do violence to those who would do us harm"
> -- George Orwell
> "All that is necessary for the triumph of evil is that good
> men do nothing!"
> -- Edmund Burke
From Fri Sep 30 15:56:24 2005