I was recalling the ribbon displays that used to be used on the floors=20
of brokerage houses. The mechanical version consisted of track of=20
vertical indicator dots about 7 elements tall. At the home station the=20
dots would be flipped over to show either yellow or black. The ribbon=20
was about 8 inches tall and ran around the ceiling like vertical train.=20
It was pretty noisy. A sudden change in the market would cause a=20
recognizable change in the sound and every one would stop and look.
A flat plate screen of raised pins seems do able to me. The electronics=20
are already there, CNC tooling greatly reduces the building complexity.
On 4/21/2013 6:22 PM, Martin McCormick wrote:
> 	There are a couple of schools of thought reflected in
> the designs of refreshable Braille displays that are
> commercially available. The more common ones have one line of
> maybe 40 or so character positions called cells. Each cell
> contains up to 6 dots, 2 columns of 3 in each cell.

--=20
John Ferrell W8CCW
That which can be destroyed by the truth should be.
P.C. HODGELL
  =20


--=20
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