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Chc2 Dx


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  • 1. Growing technology of communication Presented by Woncheol Park(James)
  • 2.
    • Innocenzo Manzetti
    • Antonio Meucci
    • Johann Philipp Reis
    • Elisha Gray
    • Alexander Graham Bell
    • Thomas Edison
    Have all been credited with pioneer work on the telephone.
  • 3.
    • 1844 — Innocenzo Manzetti first mooted the idea of a “speaking telegraph”(telephone).
    • 28 December 1871 — Antonio Meucci files a patent caveat (n.3335) in the U.S. Patent Office titled "Sound Telegraph", describing communication of voice between two people by wire.
    • 1874 — Meucci, after having renewed the caveat for two years, fails to find the money to renew it. The caveat lapses.
    • 6 April 1875 — Bell's U.S. Patent 161,739 "Transmitters and Receivers for Electric Telegraphs" is granted. This uses multiple vibrating steel reeds in make-break circuits.
    • 11 February 1876 — Gray invents a liquid transmitter for use with a telephone but does not build one.
    • 14 February 1876 — Elisha Gray files a patent caveat for transmitting the human voice through a telegraphic circuit.
    • 14 February 1876 — Alexander Bell applies for the patent "Improvements in Telegraphy", for electromagnetic telephones using undulating currents.
    • 19 February 1876 — Gray is notified by the U.S. Patent Office of an interference between his caveat and Bell's patent application. Gray decides to abandon his caveat.
    • 7 March 1876 — Bell's U.S. patent 174,465 "Improvement in Telegraphy" is granted, covering "the method of, and apparatus for, transmitting vocal or other sounds telegraphically … by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sound."
    • 10 March 1876 — The first successful telephone transmission of clear speech using a liquid transmitter when Bell spoke into his device, “Mr. Watson, come here, I want to see you.” and Watson heard each word distinctly.
    • 30 January 1877 — Bell's U.S. patent 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell.
  • 4.  
  • 5.  
  • 6.
    • Born in 3 March 1847
    • an eminent scientist, inventor and innovator
    • who is widely credited with the invention of the telephone.
    • Bell died of pernicious anemia on 2 August 1922, Beinn Bhreagh, Nova Scotia, at age 75.
  • 7.
    • Alexander Graham Bell vacationed most of his life in Nova Scotia, Canada, received a US patent for the telephone in 1877
    • the country's largest provider of telecommunications services
    • supplying voice, data, and image communications to customers in the provinces of Quebec and Ontario and in the Northwest Territories.
  • 8.
    • it was his father, Professor Melville Bell who introduced the telephone to Canada.
    • 58 years old, Melville Bell had been a teacher all his life.
    • He unveiled the new technology to the public in a series of lectures.
  • 9. Bell Speaking into Telephone
  • 10.  
  • 11.
    • Who invented the liquid transmitter?
    • Who invented the telephone? Name one of the people.
    • Who introduce the telephone in Canada?
    • When did Alexander Graham Bell died?
  • 12.
    • Visit this web site to see more history
  • 13.
    • Thank you for listening