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See also: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 See also:semaphore or See also:optical See also:telegraph of See also:Claude See also:Chappe . 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 See also:express the words of the See also:message are visual, auditory or written . See also:Land and Submarine Telegraphy will be considered in See also:Part I., with a See also:section on the commercial aspects . In Part II . Wireless Telegraphy is dealt with . |
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