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Telephones

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It took years of experimenting, with lots of failures ... 1876, theory became reality. Bell, who accidentally spilt acid on his pants, shouted into the ... – PowerPoint PPT presentation

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Title: Telephones


1
Telephones
  • By Ashley and Melissa

2
Telephones
  • Alexander Graham Bell and Elisha Gray raced away
    to transmit voices electronically over a wire.

3
Idea!
  • Bells idea was that the voice would make a metal
    disc vibrate and its vibrations could change the
    intensity of an electric circuit.

web.mit.edu/yksheire/ www/images/bulb0.gif
4
Experimenting
  • It took years of experimenting, with lots of
    failures along the way.

5
Accident
  • On March 10, 1876, theory became reality.
  • Bell, who accidentally spilt acid on his pants,
    shouted into the telephone.

www.achome.co.uk/.../accessories/ telephones.jpg
6
Mr.Watson
  • Mr. Watson was in another room and came running
    from another room to help.

7
Success
  • He heard him through the telephone.
  • That is how the telephone was invented.
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