1 / 14

Telephones

Telephones. DEJANA COATES Ms. Bornfriend PD:1. Table of Contents. Summary Question #1 Photo #1 Question #2 Photo #2 Question #3 Photo #3 Question #4 Photo # 4 Timeline Bibliography. Summary.

ronda
Télécharger la présentation

Telephones

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Telephones DEJANA COATES Ms. Bornfriend PD:1

  2. Table of Contents Summary Question #1 Photo #1 Question #2 Photo #2 Question #3 Photo #3 Question #4 Photo #4 Timeline Bibliography

  3. Summary The topic I chose was telephones. Alexander Graham Bell was the inventor of the telephone. Telephones were invented in the 1870s. They are devices that could transmit speech through electricity. The people communicate has changed as time progressed; for instance, it started with writing letters and then to telegraphs and then to telephones.

  4. #1. Who invented the telephone? The inventor of the telephone was Alexander Graham Bell. Other people claim that they invented the telephone, and there was a big feud of who created them. Bell was first to patent the telephone.

  5. #2. When were telephones invented? Telephones were invented in the 1870s. They are devices that can transmit speech through electricity.

  6. #3. How has they changed? The way people communicate has changed so much over time. It started with writing letter, then to telegraphs , then to telephones. When people wrote letters it use to take a long time for the letter to get to where its going. So they had to come p with ways that wouldn’t take as long.

  7. #4. How are telephones useful to society? Telephones allow people to better communicate. And it’s helpful in case of emergency or keeping in touch with your family and friends. Uses of the telephone: Voicemail Text messaging Email Live chat Scheduling & etc…

  8. Timeline 1900   Telephone transmission extends across and between major cities 1904   Fleming invents the vacuum diode 1915   First transcontinental telephone call 1919   Switching systems and rotary-dial telephones 1920   Frequency multiplexing concept 1947   North American Numbering Plan 1948   A Mathematical Theory of Communication 1949   First phone to combine a ringer and handset 1951   Direct long distance calling first available 1956   First transatlantic telephone cable 1962   First commercial digital transmission system 1962   Telstar 1 1963   Touch-tone telephone is introduced 1965   First electronic central office switching system 1968   First 911 call is made 1973   First portable cell phone call is made 1975   U.S. military begins using fiber optics 1976   Common channel interoffice signaling 1978   Public tests of a new cellular phone system 1990s (Mid)   Voice Over Internet Protocols 2000   100 million cellular telephone subscribers

  9. Bibliography http://www.telephontribute.com/telephone_inventors.html http://inventors.about.com/od/bstantinventors/a/telephones.htm http://library.thinkquest.org/JO112389/how_telephones_changed.htm http://wiki.anwsers.com/Q/How_is_the_telephone_useful http://www.greatachievements.org/?id=3625 http://farm4.static.flickr.com/3052/2577497902_ed30acf117_o.jpg

  10. Bibliography (continued…) https://woodward8.wikispaces.com/file/view/Alexander_Graham_Bell_in_colors.jpg/36354455/Alexander_Graham_Bell_in_colors.jpg https://store.minntelcom.com/images/2420.jpg http://www.rogersranchhouse.com/info/kitchenware_images/novelty_telephones.jpg http://www.telephoneteca.com/images/versilia1.jpg http://chestofbooks.com/reference/Wonder-Book-Of-Knowledge/images/One-of-the-Varied-Types-of-Desk-Telephones-Used-in-France.jpg http://www.telcomhistory.org/vm/Images/main/Timeline/timeline_color.jpg

More Related