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Hi Eric,
Try Electromatic Products, Inc. 23409 Industrial Park Ct., Farmington Hills, MI. (248) 615-3947. This will connect you with Tom Parrish whom I found to be very helpful with displays.
Bear in mind that as far as I know, these folks use LEDs but Tom may well be able to tell you where the other type can be found. Don't be surprised if you find that the discs are smaller than your think; we have a bus sign that works this way and the spots are about 3/4 inch in diameter. As LEDs get better, this type of sign will begin to disappear.
Also, check with London Underground in the UK.They use a similar sign type in the tube stations.
Finally, try ThomasRegister.com and type in electronic displays.
Good luck!
John Bowditch
> ----------
> From: Eric Siegel
> Reply To: Informal Science Education Network
> Sent: Friday, January 16, 2004 12:49 PM
> To: [log in to unmask]
> Subject: Traffic Sign Disks?
>
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> Hello, all:
>
> Now for something completely different! We are looking for a source of
> the kind of signs that are made of disks, perhaps three inches across,
> that are bright yellow on one side and black on the other. The display
> is made up by servo motors that flip the disks to make characters. We
> want to use this as an output device for an interactive of the Game of
> Life, the simple cellular automata program.
>
> We need a solid field of these about 30x50. Any ideas?
>
> Eric Siegel
> Director of Planning
> & Program Development
> Connections Project Director
> New York Hall of Science
> 47-01 111th Street
> Queens, NY 11368
> [log in to unmask]
> www.nyscience.org
>
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