Alexander Graham Bell

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Alexander Graham Bell
Inventor of the Telephone
By Mary Louise Shore
2005
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Alexander Graham Bell

• Born March 3, 1847
• Parents Alexander Melville Bell and Elisa Grace
  Symonds
• Siblings 2 brothers, Melville and Edward

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Childhood

• Alexander Graham Bell grew up in Edinburgh,
  Scotland with his family.

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Learning From the Family

• As a child, Bell inherited a musical talent from
  his mother, who was a musician and also a
  portrait painter.

He was taught by his grandfather and father about
public speaking.
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Hello Grandpa!
When Bell was 13 years old, he spent a year
with his grandfather in London. To Graham, this
year was the turning point of his life.
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Herman von Helmholtz
Bell read books in the library about Herman
von Helmholtz, a German scientist who
experimented with electrical vibrations to make
vowel sounds.
He researched his experiments so that someday
he might be able to reconstruct them in his own
home.
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Early Life
At the Age of 16, Graham began to teach music
and speech at a boys school. Years later, Bell
started teaching his fathers visual speech to
deaf and hearing impaired children.
Bell at age 29
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Tuberculosis-1870

In 1870, Bells two brothers died of
tuberculosis.
Since Bell was also threatened his family decided
to move to a healthier environment, Canada.
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Hello Boston! Good-bye Canada!
After Graham was safe from catching the
disease, his job led him to be a physiology
professor at Boston University in the United
States.
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Boston University
While Bell was in Massachusetts, he invented
the harmonic telegraph, an instrument that makes
it possible to send multiple telegraphs on one
line.
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The Telephone is Patented
On March 7, 1876, Bell recieved his patent
for the telephone.
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Mr.Watson, come here, I want you.

On March 10, 1876, Alexander Graham Bell was
in his testing room with his partner, Watson.
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Reeds
The experiment they were working with had
reeds that were thin and steel. One of the reeds
was stuck so Watson plucked it to try to fix it.
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Successful!
When he did, Graham heard the vibration
clearly through the newly invented telephone.
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The Simple Telephone

There are three parts to the simple telephone.
The Speaker, the Microphone and the Switch, also
known as the Hook Switch.
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The Hook Switch
The Hook Switch connects and disconnects the
phone from the telephone network. The network is
connected when you pick up the phone.
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The Speaker
The speaker picks up the sounds waves from the
other line, and sends them through the network to
your ear drums. The sounds vibrate in your ear,
and you then have sound.
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The Microphone
The microphone has a diaphragm where the sounds
waves vibrate the area. The amplifier, a small
part of the telephone then sends it through to
the other lines speaker, reinterpreting the
sounds into physical vibrations.
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A More Modernized Telephone
To make up the real telephone there are the 3
major parts, like the simple phone, and 3 more
new parts,
these include the Duplex coil, the keypad and the
ringer.
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The Duplex Coil
In the simple phone, you can hear yourself
through the speaker when you talk. The Duplex
coil is a device that enables you to speak into
the microphone without hearing your voice.
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The Ringer
The Ringer was also an improvement made from the
simple telephone. The ringer is made up of a
bell so that you are aware when another line is
calling you.
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Keypad
The touch tone keypad consists of twelve
buttons. It has the digits 1-9, and zero. To the
left of the zero is the star key. Located on
its right is the pound key.
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The Telephone
The telephone may seem like a complicated
machine, but it really is one of the simplest
devices that you may find in your home, or
anywhere else you can imagine.
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The Telephone Today
Today, phones have been able to get even smaller
and even have no cords. In the bottom left,
there is a palm pilot that can also be used at a
phone. The telephone is a unique piece of
equipment. No one can imagine our world without
it.
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A Sad day in History
On August 2, 1922, Alexander Graham Bell died
at his home in Baddek Nova Scotia.
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Bibliography
---. Alexander Graham Bell. Lucid Café.
---.---. April 27, 2005 lt http//www.lucidcafe.com
/library196mar/bell.htmlLrelated gt Bell,
Alexander Graham. The New Book of Knowledge. B,
2000 edition Bell, Alexander Graham. Academic
American Encycopedia. B 1991 ---. Telephone.
How Stuff Works. ---.---. April 30, 2005 lt
http//www.howstuffworks.com/telephone5.htm gt
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About Me!
My name is Mary Louise Shore and I love to
travel, play volleyball, watch Ncstate basketball
and smile! I love skittles and oreos.