telephone history by rishit chandarana

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The telephone
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The Telephone

• A telephone is an instrument that sends and
  receives information, usually by means of
  electricity. 
• The word telephone comes from Greek words meaning
  far and sound. 
• The telephone is one of our best ways to
  communicate. 
• In an emergency a telephone can save your life. 
• You can make a telephone call almost anywhere in
  the world. 
• Telephones are even used in cars, planes, ships,
  and on lots of different mechanical machines.

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Box" Telephone, 1876, invented by Alexander
Graham Bell
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The Telephone

• While Alexander Graham Bell was experimenting
  with telegraph instruments in the early 1870s, he
  realized it might be possible to transmit the
  human voice over a wire by using electricity
• Bell's interest in electricity continued and he
  attempted to send several telegraph messages over
  a single wire at one time.

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The Telephone

• Lacking the time and skill to make the equipment
  for these experiments he enlisted the help of
  Thomas A. Watson. The two became fast friends and
  worked together on the tedious experimentation to
  produce sounds over the "harmonic telegraph."
• It was on June 2, 1875, while Bell was at one end
  of the line and Watson worked on the reeds of the
  telegraph in another room that he heard the sound
  of a plucked reed coming to him over the wire.

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The Telephone

• The next day, after much tinkering, the
  instrument transmitted the sound of Bell's voice
  to Watson.
• The instrument transmitted recognizable voice
  sound, not words.
• Bell and Watson experimented all summer and in
  September, 1875,
• Bell began to write the specifications for his
  first telephone patent.
• By March 1876 he managed to make a transmission,
  but the sound was very faint.

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The Telephone

• The patent was issued on March 7, 1876.
• The telephone carried its first intelligible
  sentence three days later in the rented top floor
  of a Boston boarding house at 109 Court Street,
  Boston
• By the summer of 1877, the telephone had become a
  business. The first private lines, which
  typically connected a businessman's home and his
  office, had been placed in service

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The Telephone

• From the telephone's earliest days, Bell
  understood his invention's vast potential. He
  wrote in 1878
• "I believe in the future, wires will unite the
  head offices of telephone companies in different
  cities, and a man in one part of the country may
  communicate by word of mouth with another in a
  distant place."

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The first mobile phone
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The First Mobile Phone

• Dr. Martin Cooper of Motorola, made the first
  private handheld mobile phone call on a larger
  prototype model in 1973.

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The most recent...
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Follow-On Work

• Pairwork
• A interviewer B Alexander Bell
• Newsflash!! The telephone has been created.
• Interview Bell for the news ..
• Writing
• Write a newspaper report to follow this on..

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• By
• RISHIT .V. CHANDARANA
• YEAR 2012 2013