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Human communication was initiated with the origin of speech approximately 100,000 BCE. [1] Symbols were developed about 30,000 years ago. The imperfection of speech allowed easier dissemination of ideas and eventually resulted in the creation of new forms of communication, improving both the range at which people could communicate and the longevity of the information.
Journalism and Communication Monographs 11#.4 (2010) Miller, David, and William Dinan. "The rise of the PR industry in Britain, 1979-98." European Journal of Communication 15#.1 (2000): 5-35. Miller, David, and William Dinan. A century of spin: How public relations became the cutting edge of corporate power (Pluto Press, 2007), A view from the left
In 1900, Reginald Fessenden was able to wirelessly transmit a human voice. Millimetre wave communication was first investigated by Bengali physicist Jagadish Chandra Bose during 1894–1896, when he reached an extremely high frequency of up to 60 GHz in his experiments. [25]
1900 illustration of Professor Morse sending the first long-distance message – "WHAT HATH GOD WROUGHT" – on 24 May 1844. The Morse system uses a single wire between offices. At the sending station, an operator taps on a switch called a telegraph key, spelling out text messages in Morse code. Originally, the armature was intended to make ...
The feedlines feeding radio power from the transmitter to the huge flattop wire antenna are visible, top. A list of early wireless telegraphy radio stations of the Marconi Wireless Telegraph Co. Guglielmo Marconi developed the first practical radio transmitters and receivers between 1895 and 1901.
Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless telegraph systems proposed and tested. [4] In April 1872 William Henry Ward received U.S. patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. [5]
In the late 1800s and early 1900s, a new breed of women started to emerge from the depths of circus tents around the world: the strong-woman. These women quickly drew large crowds of circus lovers ...
The pair of wires from the central office switch to a subscriber's home is called a subscriber loop. It carries a direct current (DC) voltage at a nominal voltage of −48V when the receiver is on-hook, supplied by a power conversion system in the central office. This power conversion system is backed up with a bank of batteries, resulting in ...