Chc2 Dx


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Chc2 Dx

  1. 1. Growing technology of communication Presented by Woncheol Park(James)
  2. 2. <ul><li>Innocenzo Manzetti </li></ul><ul><li>Antonio Meucci </li></ul><ul><li>Johann Philipp Reis </li></ul><ul><li>Elisha Gray </li></ul><ul><li>Alexander Graham Bell </li></ul><ul><li>Thomas Edison </li></ul>Have all been credited with pioneer work on the telephone.
  3. 3. <ul><li>1844 — Innocenzo Manzetti first mooted the idea of a “speaking telegraph”(telephone). </li></ul><ul><li>28 December 1871 — Antonio Meucci files a patent caveat (n.3335) in the U.S. Patent Office titled &quot;Sound Telegraph&quot;, describing communication of voice between two people by wire. </li></ul><ul><li>1874 — Meucci, after having renewed the caveat for two years, fails to find the money to renew it. The caveat lapses. </li></ul><ul><li>6 April 1875 — Bell's U.S. Patent 161,739 &quot;Transmitters and Receivers for Electric Telegraphs&quot; is granted. This uses multiple vibrating steel reeds in make-break circuits. </li></ul><ul><li>11 February 1876 — Gray invents a liquid transmitter for use with a telephone but does not build one. </li></ul><ul><li>14 February 1876 — Elisha Gray files a patent caveat for transmitting the human voice through a telegraphic circuit. </li></ul><ul><li>14 February 1876 — Alexander Bell applies for the patent &quot;Improvements in Telegraphy&quot;, for electromagnetic telephones using undulating currents. </li></ul><ul><li>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. </li></ul><ul><li>7 March 1876 — Bell's U.S. patent 174,465 &quot;Improvement in Telegraphy&quot; is granted, covering &quot;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.&quot; </li></ul><ul><li>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. </li></ul><ul><li>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. </li></ul>
  4. 6. <ul><li>Born in 3 March 1847 </li></ul><ul><li>an eminent scientist, inventor and innovator </li></ul><ul><li>who is widely credited with the invention of the telephone. </li></ul><ul><li>Bell died of pernicious anemia on 2 August 1922, Beinn Bhreagh, Nova Scotia, at age 75. </li></ul>
  5. 7. <ul><li>Alexander Graham Bell vacationed most of his life in Nova Scotia, Canada, received a US patent for the telephone in 1877 </li></ul><ul><li>the country's largest provider of telecommunications services </li></ul><ul><li>supplying voice, data, and image communications to customers in the provinces of Quebec and Ontario and in the Northwest Territories. </li></ul>
  6. 8. <ul><li>it was his father, Professor Melville Bell who introduced the telephone to Canada. </li></ul><ul><li>58 years old, Melville Bell had been a teacher all his life. </li></ul><ul><li>He unveiled the new technology to the public in a series of lectures. </li></ul>
  7. 9. Bell Speaking into Telephone
  8. 11. <ul><li>Who invented the liquid transmitter? </li></ul><ul><li>Who invented the telephone? Name one of the people. </li></ul><ul><li>Who introduce the telephone in Canada? </li></ul><ul><li>When did Alexander Graham Bell died? </li></ul>
  9. 12. <ul><li>Visit this web site to see more history </li></ul><ul><li> </li></ul>
  10. 13. <ul><li>Thank you for listening </li></ul>