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tel' i kom mU' ni kA' shun, the transmission of information in the form of electromagnetic signals


Alexander Graham BellAlexander Graham Bell
became interested in the electrical transmission of speech due to an interest in helping deaf people learn to speak. His experiments led to development of the telephone, for which he received a patent on March 7, 1876.
Atlantic CableAtlantic Cable
The first telegraph link between North America and Europe was completed in 1858. Unfortunately, the cable failed within a month. Another cable was laid in 1866, and this one proved permanent.
Lee De ForestLee De Forest
invented a vacuum tube that could amplify a weak electrical signal, in 1907. The Audion, as he called it, proved to be the fastest electronic switching element of the time, and would not be improved upon until the invention of the transistor in 1948. He was also the first to use the term "radio" instead of "wireless telegraphy," and developed a process for recording sound on movie film.
Echo 1Echo 1
was the world's first communications satellite capable of relaying signals. Launched from Cape Canaveral on August 12, 1960, it relayed the first live voice communication via satellite, the first coast-to-coast telephone call, and the first image transmitted via satellite. One of its receiving antennas also picked up the first solid evidence of the Big Bang.
Philo Taylor FarnsworthPhilo Taylor Farnsworth
began working on what became the television while still in high school. On September 7, 1927, he and a small group of investors watched as his system transmitted its first crude image.
was the first active communications satellite. It was launched from Cape Canaveral on July 10, 1962. It relayed its first live television pictures -- of a flag outside its ground station in Andover, Maine -- on the date of its launch, and relayed the first live transatlantic television signal on July 23.
Samuel Finley Breese MorseSamuel Finley Breese Morse
struggled for many years to gain recognition as a painter, but became better known for the telegraph, which he successfully demonstrated to Congress and the public on May 24, 1844.
Demonstrated by Du Mont Laboratories, Inc., in 1958, this television set permitted persons to watch either of two programs tuned in simultaneously.
Almon StrowgerAlmon Strowger
was an undertaker who had become frustrated over human telephone operators misdirecting calls from his customers. Determined to get rid of the need for human operators, he invented the automatic telephone exchange in 1891, and the dial telephone in 1896.
Fax Machine, 1961Fax Machine
an example from 1961
Best Buy Co, Inc. The MiteThe "Mite"
was a miniaturized 12-pound page teleprinter, the smallest and lightest printing telegraph machine in history, that was tested for use by Western Union in 1957.
  Push-Button TelephonePush-Button Telephone
  Radio in 1961Radio in 1961
  Telephone Distributing FrameTelephone Distributing Frame

The Robinson Library >> Technology >> Electrical and Nuclear Engineering