The Telephone

Akeylah Brown

The Inventor

  • Alexander Graham Bell:He was an Scottish-born American scientist best known as the inventor of the telephone. He worked at a school for the deaf while attempting to invent a machine. He was educated in the University of London. He died in 1922,at his summer home on Cape Breton Island, Nova Scotia.
  • Although his schoolwork was poor, his mind was very active. One day, he was playing at a flour mill owned by the family of a young friend. Bell learned that de-husking the wheat grains took a lot of effort and was also very boring. He saw that it would be possible for a machine to do the work, so he built one. He was only 12 at the time. The machine he built was used at the mill for several years.
  • Speech had become his life: his mother had gone deaf, and Bell’s father had developed a method of teaching deaf people to speak, which Bell taught. His research into mechanizing human speech had become a relentless obsession: in the UK it had driven him almost to collapse.
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About The Telephone

The Telephone : The telephone was detected into metals in wounds and with a vacuum-jacket respirator that led to the development of the iron lung. When bell was teaching he experimented with a means of transmitting several telegraph messages.
  • The telephone was used in Businesses, Schools, and homes. It is a source of entertainment and a vital resource. The invention of the telephone lead to development of city centers, office buildings and the concept of an urban worker society. It has lead to the creation and destruction of jobs.
  • In the transmitter, the liquid resistor transferred to an electric circuit the vibrations of a needle attached to a diaphragm which had been made to vibrate by sound. The electrical resistance of the circuit changed in tandem with the needle’s position in the liquid, and so sound was converted into an equivalent electrical signal. The receiver converted the electrical signal back into sound using a vibrating needle in liquid connected to a diaphragm which vibrated to recreate the sound that had been transmitted.
  • The telegraph and telephone are both wire-based electrical systems, and Alexander Graham Bell's success with the telephone came as a direct result of his attempts to improve the telegraph.

    When Bell began experimenting with electrical signals, the telegraph had been an established means of communication for some 30 years. Although a highly successful system, the telegraph, with its dot-and-dash Morse code, was basically limited to receiving and sending one message at a time.

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More Important Information

The first touch-tone system - which used tones in the voice frequency range rather than pulses generated by rotary dials - was installed in Baltimore, MD, in 1941. Operators in a central switching office pushed the buttons; it was much too expensive for general use. However, the Bell System was intrigued by touch-tone because it increased the speed of dialing.

Not Just the Telephone

Alexander Graham Bell had a restless mind. The telephone made him wealthy and famous, but he wanted new challenges, and he continued inventing and innovating.

Alexander Graham Bell And His First Invention (VOICE)

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Alexander Graham Bell's Voice, ca. 1885