The telephones parents
Since the age of 18 Bell had been working on the idea of transmitting speech. In 1874, while working on a multiple telegraph, he developed the basic ideas for the telephone. His experiments with his assistant Thomas Watson finally proved successful on March 10, 1876, when the first complete sentence was transmitted: “Watson, come here; I want you”. Subsequent demonstrations, particular[...]DOWNLOAD REFERAT
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He died on August 2, 1922, at Baddeck, where the Canadian government maintains a museum containing many of his original inventions. Morse Code, International, system of signals employed in radiotelegraphy in the land-telegraph systems of all countries except the United States and Canada, and by all countries in flash lamp communications in marine navigation.
The system is an adaptation of Morse code, the original telegraph alphabet devised by the American inventor Samuel F. B. Morse. When other countries adopted the International Morse Code for sending radiotelegraphy messages in the 1850s, the United States and Canada continued to use the original Morse code. International Morse Code consists of combinations of dots and dashes representing the letters of the alphabet and numerals, as shown in the accompanying table. The duration of one dash equals that of three dots. Today, International Morse Code is rarely used, because radiotelegraphy has been replaced by printing telegraph systems, and facsimile transmission. The international code of signals however, is still used to ensure the safety of navigation and people at sea.
Communication instrument designed to transmit speech and other sounds to a distant point by means of electricity, and to reproduce them. The telephone contains a diaphragm, which vibrates when struck by sound waves. The vibrations (wave motion) are converted into electrical impulses and transmitted to a receiver, which converts the impulses back into sound.
In common usage, the term “telephone” is also applied in a much broader sense to the entire system to which an individual telephone set is connected; a system which allows the sending of not only a user’s voice but also data, pictures, or any other information which can somehow be encoded and converted into electrical energy. This information is exchanged between points connected to the network. The telephone network consists of all of the transmission paths between subscriber’s sets and of the switching machinery used to select a particular path or group of paths between subscribers « mai multe referate din Engleza