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Through the years other machines were invented, both to receive and transmit messages. These machines are called teleprinters. They use a code called the International 5-unit teleprinter code instead of the Morse code. It is called a "5-unit" code because a letter or a figure is made up of five impulses of electrical current, either positive or negative - three positive, two negative; one positive, four negative; and so on. All the letters are the same length in time. This is quite different from the Morse code, where E is the shortest and "nought" the longest.
In the Morse code all the letters are the same length in time.
These machines are called telephones.
New machines could only transmit messages.
In the International 5-unit teleprinter code all the letters take the same length of time to transmit.
