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THE TELEGRAPH
The telegraph was an invention to send messages in morse code. Each telegraph station had a transmitter and a receiver. The user had to activate a switch that made a pen write dots and lines in a paper. The dots and lines were the message. -
Multiplexing
It allowed people send multiple messages using a single cable. -
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THE TELEPHONE
The telephone is an invention that has changed people's lives radically. History books said that Graham Bell was the original creator of the telephone, but the US Congress realized the true inventor of the telephone was an Italian called Antonio Meucci. Antonio had financial problems, hich didn't let him make a good production of telephones, but then it was Graham Bell who produced them a lot. -
MOBILE PHONE
Mobile telephony is wireless and is the type of telephony we use in the present. The first mobile phone was made by Martin Cooper in April 3, 1973, while working in Motorola. Cooper said it was inspired by the series Star Trek. The population began in the 1990's and it has been growing since then. There are places called cells to increase the number of simultaneous calls.