IEEE Spectrum March, 2007 - 31

EARLY SIGNALS: This
vacuum tube was used to
receive images during the
first U.S. public demonstration of television in 1927. The
signal was transmitted by
radio from Whippany, N.J.,
to an auditorium at the Bell
Labs building in downtown
New York City. The audience
consisted of members of
the American Institute of
Electrical Engineers and the
Institute of Radio Engineers,
the IEEE's two predecessor
societies. The tube created
pulses of light, which were
directed by a scanning
wheel receiver to form the
viewable image.
A loop antenna [below],
built in the 1920s, consists of
12 coils of wire on a wooden
frame. The basic design, still
favored by do-it-yourselfers
because it is easy to build
and can pick up weak signals,
needs to be pointed directly
at the signal source.

SMALL AND BIG: A prototype of a
Labs researchers Gerald Pearson,
strips of silicon embedded in clear
The battery generated 0.185 watts
a record at the time. In a cloud of b
switchboard probably used in an of
20th century. The operator who ra
route calls by hand but also run the

SACRED SCROLLS: These yellowing computer printouts captured telemetry from
the launch of AT&T's Telstar I, the first commercial communications satellite and
the first privately owned satellite of any kind. Launched from Cape Canaveral on
10 July 1962, it was short-lived; radiation from a U.S. nuclear test and from sunlight fried its circuits, and it failed irreparably in February of the following year.
It remains in orbit today.

36 IEEE Spectrum | March 2007 | NA

www.spectrum.ieee.org

http://www.spectrum.ieee.org

Table of Contents for the Digital Edition of IEEE Spectrum March, 2007

IEEE Spectrum March, 2007 - Cover1
IEEE Spectrum March, 2007 - Cover2
IEEE Spectrum March, 2007 - 1
IEEE Spectrum March, 2007 - 2
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IEEE Spectrum March, 2007 - 4
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IEEE Spectrum March, 2007 - 42
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IEEE Spectrum March, 2007 - 47
IEEE Spectrum March, 2007 - 48
IEEE Spectrum March, 2007 - Cover3
IEEE Spectrum March, 2007 - Cover4
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