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Clifford:

Right, I knew that...Seriously, I did know that this idea has been
around for some time, and that it has been used in exhibits.  We are
planning to make a demo out of it, and a physicist/educator who works
for IBM has been doing this in schools, etc.  So it is more a matter of
adaptation then invention.


Eric Siegel
Director, Planning & Program Development
Connections Project Director
New York Hall of Science
47-01 111th Street
Queens, NY 11369
[log in to unmask]
www.nyscience.org

On Mar 30, 2004, at 7:19 PM, Clifford Wagner wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology
> Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> ***********************************************************************
> ******
>
> It's already been prototyped, Eric, about 125 years ago. :-)  Still a
> good
> device.
> Alexander Graham Bell also invented the photophone in 1880, just a
> couple of
> years after it was discovered that selenium changed its resistance
> depending
> upon its exposure to light.  There are drawings of what he made that I
> used
> to make a look-alike copy for a communications exhibit  we did at the
> Franklin around 1986.  I used Mylar as a 2" diameter membrane vibrated
> by
> visitors
> voice.  The light source was a spot and the receiver was a cheap solar
> cell
> connected to an amp.
>
> I just love google!  Here's a working drawing from Alexander himself!
> http://www.americaslibrary.gov/jb/gilded/jb_gilded_bell_2_e.html
> Looks like one of mine- "thinking" drawings like this one are almost
> always
> crude.
>
> The thing I built was based on his transmitter seen here.
> http://www.bell-labs.com/org/physicalsciences/timeline/span2.html#
> We had better line drawings of it to go by; they must exist somewhere.
>
> ----- Original Message -----
> From: "Eric Siegel" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, March 30, 2004 2:52 PM
> Subject: Re: Telecommunications activities
>
> .
>
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