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Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American inventor and painter. After establishing his reputation as a portrait painter, Morse, in his middle age, contributed to the invention of a single-wire telegraph system based on European telegraphs.
Baudot developed his first multiplexed telegraph in 1872 [3] [4] and patented it in 1874. [4] [5] In 1876, he changed from a six-bit code to a five-bit code, [4] as suggested by Carl Friedrich Gauss and Wilhelm Weber in 1834, [3] [6] with equal on and off intervals, which allowed for transmission of the Roman alphabet, and included punctuation and control signals.
The history of telecommunication began with the use of smoke signals and drums in Africa, Asia, and the Americas. In the 1790s, the first fixed semaphore systems emerged in Europe . However, it was not until the 1830s that electrical telecommunication systems started to appear.
Phillip Hagar Smith (April 29, 1905 – August 29, 1987) was an American electrical engineer, who became famous for his invention of the Smith chart.. Smith was born in Lexington, Massachusetts in 1905, and graduated from Tufts College in 1928 with a BS degree in electrical engineering.
Vail invented an extended code that included code points for all the letters so that any desired word could be sent. It was Vail's code that became American Morse. In France, the telegraph used the Foy-Breguet telegraph , a two-needle telegraph that displayed the needles in Chappe code, the same code as the French optical telegraph, which was ...
Given this growth, telecommunications play an increasingly important role in the world economy and the global telecommunications industry was about a $4.7 trillion sector in 2012. [ 39 ] [ 40 ] The service revenue of the global telecommunications industry was estimated to be $1.5 trillion in 2010, corresponding to 2.4% of the world's gross ...
Many electrical telegraph systems were invented that operated in different ways, but the ones that became widespread fit into two broad categories. First are the needle telegraphs, in which electric current sent down the telegraph line produces electromagnetic force to move a needle-shaped pointer into position over a printed list.
An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...