communication By bobbobstar May 20, 700 Hindu-Malayan empires write legal documents on copper plate scrolls, and write other documents on more perishable media May 20, 751 Paper is introduced to the Muslim world after the Battle of Talas May 20, 1305 The Chinese develop wooden block movable type printing May 20, 1450 Johannes Gutenberg finishes a printing press with metal movable type May 20, 1520 Ships on Ferdinand Magellan's voyage signal to each other by firing cannon and raising flags. May 20, 1793 Claude Chappe establishes the first long- distance semaphore telegraph line May 20, 1831 Joseph Henry proposes and builds an electric telegraph May 20, 1835 Samuel Morse develops the Morse code May 20, 1843 Samuel Morse builds the first long distance electric telegraph line May 20, 1844 Charles Fenerty produces paper from a wood pulp, eliminating rag paper which was in limited supply May 20, 1849 Associated Press organizes Nova Scotia pony express to carry latest European news for New York newspapers May 20, 1876 Alexander Graham Bell and Thomas A. Watson exhibit an electric telephone in Boston May 20, 1877 Thomas Edison patents the phonograph May 20, 1889 Almon Strowger patents the direct dial telephone May 20, 1901 Guglielmo Marconi transmits radio signals from Cornwall to Newfoundland May 20, 1925 John Logie Baird transmits the first television signal May 20, 1942 Hedy Lamarr and George Antheil invent frequency hopping spread spectrum communication technique May 20, 1947 Douglas H. Ring and W. Rae Young of Bell Labs proposed a cell- based approach which leads to "cellular phones" May 20, 1949 Claude Elwood Shannon, the "father of information theory", mathematically proves the Nyquist–Shannon sampling theorem May 20, 1958 Chester Carlson presents the first photocopier suitable for office use May 20, 1963 First geosynchronous communications satellite is launched, 17 years after Arthur C. Clarke's article May 20, 1966 Charles Kao realizes that silica- based optical waveguides offer a practical way to transmit light via total internal reflection May 20, 1969 The first hosts of ARPANET, Internet's ancestor, are connected. May 20, 1971 Erna Schneider Hoover invented a computerized switching system for telephone traffic. May 20, 1977 Donald Knuth begins work on TeX May 20, 1989 Tim Berners- Lee and Robert Cailliau built the prototype system which became the World Wide Web at CERN May 20, 1991 Anders Olsson transmits solitary waves through an optical fibre with a data rate of 32 billion bits per second May 20, 1992 Neil Papworth sends the first SMS (or text message).
