Telecommunication

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By itself the telegraph could express only two states, on or off. This
limitation was eliminated by the fact that it was the duration of the connection
that determined the dot and dash from each other being short and long
respectively. From these combinations of dots and dashes the Morse code was
formed. The code included all the letters of the English alphabet, all the
numbers and several punctuation marks. A variation to the telegraph was a
receiving module that Morse had invented. The module consisted of a
mechanically operated pencil and a roll of paper. When a message was received
the pencil would draw the corresponding dashes and dots on the paper to be
deciphered later. Many inventors including Alexander Bell and Thomas Edison
sought to revolutionize the telegraph. Edison devised a deciphering machine.
This machine when receiving Morse code would print letters corresponding to the
Morse code on a roll of paper hence eliminating the need for decoding the ...

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resistance between the rod and the cup of acid.
One of the greatest drawbacks to this model was that the cup of acid would have
to be constantly refilled. The second of Bell's prototypes was the induction
telephone transmitter. It used the principle of magnetic induction to change
sound into electricity. The membrane was attached to a metal rod which was
surrounded by a coil of wire. The movement of the rod in the coil produced a
weak electric current. An advantage was that theoretically it could also be
used both as a transmitter and a receiver. But since the current produced was
so weak, it was unsuccessful as a transmitter. Most modern day telephones still
use a variation ...

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