Detailansicht
Early telecommunications
Telecommunication, Carrier pigeon, Photophone, Smoke signal, Beacon, Semaphore line, Relay league, Claude Chappe, Canadian Parliamentary Motion on Alexander Graham Bell, Mechanical television, Heliograph, Homing pigeon, Whistled language
ISBN/EAN: 9781155441658
Umbreit-Nr.: 3784329
Sprache:
Englisch
Umfang: 40 S.
Format in cm: 0.3 x 24.6 x 18.9
Einband:
kartoniertes Buch
Erschienen am 20.06.2012
Auflage: 1/2012
- Zusatztext
- Source: Wikipedia. Pages: 39. Chapters: Telecommunication, Carrier pigeon, Photophone, Smoke signal, Beacon, Semaphore line, Relay league, Claude Chappe, Canadian Parliamentary Motion on Alexander Graham Bell, Mechanical television, Heliograph, Homing pigeon, Whistled language, Bullroarer, Drum, Speaking tube, Hydraulic telegraph, Signal lamp, Polybius square, Fiery cross, Abraham Niclas Edelcrantz, Telephonoscope, Fryctoria, Telegraph hill. Excerpt: Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded drumbeats, lung-blown horns, or sent by loud whistles, for example. In the modern age of electricity and electronics, telecommunications now also includes the use of electrical devices such as telegraphs, telephones, and teleprinters, the use of radio and microwave communications, as well as fiber optics and their associated electronics, plus the use of the orbiting satellites and the Internet. A revolution in wireless telecommunications began in the first decade of the 20th century with pioneering developments in wireless radio communications by Nikola Tesla and Guglielmo Marconi. Marconi won the Nobel Prize in Physics in 1909 for his efforts. Other highly notable pioneering inventors and developers in the field of electrical and electronic telecommunications include Charles Wheatstone and Samuel Morse (telegraph), Alexander Graham Bell (telephone), Edwin Armstrong, and Lee de Forest (radio), as well as John Logie Baird and Philo Farnsworth (television). Telecommunications play an important role in the world economy and the worldwide telecommunication industry's revenue was estimated to be $3.85 trillion in 2008. The service revenue of the global telecommunications industry was estimated to be $1.7 trillion in 2008, and is expected to touch $2.7 trillion by 2013. Greek hydraulic semaphore systems were used as early as the 4th century BC. The hydraulic semaphores, which worked with water filled vessels and visual signals, functioned as optical telegraphs. However, they could only utilize a very limited range of pre-determined messages, and as with all such optical telegraphs could only be deployed during good visibility conditions. During the Middle Ages, chains of beacons were com