Date: Fri, 26 Sep 2003 08:25:43 -0400

Author: Gerald Zani

Subject: Re: Motion of falling bodies demo

Post:

Gary,

I don't know of one to buy, so I would advise to go homemade. I once saw
something that is perfect for you. It is a simple mechanism that used a
small air pump and a Venturi fitting that blows air into tygon tube to pull
balls out of a lower bucket and lift them some height to dispense them into
a higher hopper.

The one I saw was made for a trade show booth by a colleague at an
industrial company I once worked for 12 years ago. It continually dropped
balls and detected them as they crossed an IR light curtain. The detector
was called the "Die Spy". It was a control device that was made for the
metal stamping industry to stop a stamping machine if a piece was not
ejected after it was stamped by the die. Jerry

E-mail or call me if you have questions. Jerry

At 04:04 PM 9/25/2003 -0400, you wrote:
> I'm trying to recreate an old demo that was used in the 60's that
>is similar to Meiners 7-1.15 (page 115). Basically its an apparatus that
>drops balls at a set rate in synchronization with a strobe. The main
>difficulty is the dispenser--does anyone know of any industrial or
>consumer products that can dispense regular objects at a set rate? Or
>will this have to be custom made...
>
>Gary Steinberg

Gerald Zani e-mail: Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA

URL http://www.physics.brown.edu/users/staff/zani/index.html
URL http://www.physics.brown.edu/Studies/Demo/

Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.
Now's your chance.
Henry David Thoreau, Journal entry, 1850.
From jelwell@wooster.edu Fri Sep 26 06:15:13 2003
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