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This is a free sample preview of the essay
The Telephone
Beginning of essay
About 100 years ago, Alexander Graham Bell invented by
accident with his assistant Mr. Watson. Over many years, the modern version of
makes the one that Bell invented look like a piece of junk.
Developments in tone dialing, call tracing, music on hold, and electronic
ringers have greatly changed ....
Middle of essay
....e carbon expands and
contracts, depending on what force is exerted. At two points on the outer shell
of the reservoir of the carbon are two outlets of electricity from the talk
battery. By applying voltage, a current is made and is passed along the lines to
the waiting telephone. At the other end the current is transformed back to
speech.
THE RECEIVER
The receiver turns an ever varying current back to speech. A permanently
magnetized soft iron core is covered in many turns of very fine wire. .... |
| Number of words: 1495 |
Approximate pages: 6 |
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