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TELEGRAPH (Gr. Tike, far, and rypaq5eiv, to write) , the name given to an apparatus for the transmission of intelligence to a distance . Etymologically the word implies that the messages are written, but its earliest use was of appliances that depended on visual signals, such as the semaphore orSee also: optical telegraph of See also: Claude See also: Chappe
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The word is still some-times employed in this sense, as of the See also: ship's telegraph, by means of which orders are mechanically transmitted from the navigating See also: bridge to the See also: engine See also: room, but when used without qualification it usually denotes telegraphic apparatus worked by See also: electricity, whether the signals that express the words of the message are visual, auditory or written
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See also: Land and Submarine Telegraphy will be considered in See also: Part I., with a section on the commercial aspects
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In Part II
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Wireless Telegraphy is dealt with
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