DEVC 30 EXAM

• Benjamin Franklin proved that lightning was a form of electricity.
• Discovery of electricity (1752)
• Michael Faraday and Joseph Henry experimented with electromagnets
• magnetism provided the basis for research into electrical communication
• Invention of the telegraph (1835)
• Samuel F.B. Morse invented the electromagnetic telegraph
• electromagnetic telegraph was the breakthrough to

  today’s communication.
• What hath God wrought? was the very first message in Morse Code
• James Clerk Maxwell discovered the electromagnetic waves (radio waves), on which communication signals could be carried very much like signals over telegraph wires.
• Electromagnetic theory (1865)
• Development of the telephone (1875)
• Alexander Graham Bell accidentally discovered the telephone concept.
• Heinrich Hertz - Electricity travels through space in waves at a speed of light
• In 1895, Guglielmo Marconi was credited with inventing radio when he

  successfully demonstrated sending and receiving radio signals.
• Discovery of the electron tube (1833)
• Thomas Alva Edison had already observed the emission of electron from a heated surface as a tube’s cathode.
• Sir J.J. Thomson discovered the electron tube (1890s).
• Lee de Forest (foremost practitioner and father of radio)
• December 24, 1906 – Reginald Fessenden broadcast from Brant Rock, Massachusetts to radio operators of ships in the Atlantic Ocean.
• Giovanni Caselli invented the pantelegraph
• pantelegraph

  • A system of sending and receiving images over

  long distances by means of telegraph

  • First prototype of a fax machine
• Willoughby Smith and Joseph May’s experiment with selenium and light

  • Two telegraph engineers accidentally discover

  that more electricity flows through selenium

  in light than it does in the dark.

  • Gave future inventors a way of transforming

  images into electrical signals
• Alexander Bell discovers voice transmission in 1876
• Paul Nipkow’s Nipkow Disk (scanning device)

  • Gave television its first practical means for

  transmitting pictures

  • Permits the image to be broken up into

  elements that could be transmitted as

  electrical impulses.
• William Kennedy Laurie Dickson, Thomas Edison’s assistant, devised The Kinetograph
• The kinetograph was a crude, motor-powered camera that could photograph motion pictures which led to emergence of motion pictures in

  1889
• The Eastman Kodak Company develops the first motion picture film designed for projection.
• The first cathode ray tube scanning device invented by the Karl Ferdinand Braun
• The Cathode Ray Tube—the picture tube found in modern television

  sets
• The Electronic television was based on the

  development of the cathode ray tube
• First use of the word ‘television’ was on the First International Congress of Electricity at

  the World’s Fair in Paris
• Russian scientist Constantin Perskyi made the first known use of the word "television."
• Alan Swinton proposed a TV system for the cathode ray tube as both

  scanner and receiver, reproducing an image
• the iconoscope, a camera tube in which a beam of high-velocity

  electrons scans a photoemissive mosaic.
• Vladimir Zworykin’s iconoscope and kinescope (a crude TV system)
• Charles Jenkins

  • Pioneer of early cinema technology

  • Transmitted moving silhouette images for witnesses in 1923

  • Publicly demonstrated synchronized transmission of silhouette pictures and sounds
• Scotsman John Logie Bard demonstrated a working television system.
• • Sound was adopted to motion pictures

  • Crude form of colored TV was introduced

  in 1928
• Philo Farnsworth

  • Father of television

  • First inventor to transmit

  a television image

  comprised of 60

  horizontal lines

  • Produced an all-electronic

  television image using his

  wife, Pem, as the first

  human subject to be

  transmitted on television
• 1939 was the start of regular TV broadcasts