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semaphore
(redirected from Optical telegraph)

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semaphore

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The semaphore signals for the letters of the alphabet and some special signals.

Visual signalling code in which the relative positions of two movable pointers or hand-held flags stand for different letters or numbers. The system is used by ships at sea and for railway signals.
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1791: The optical telegraph (semaphore machine) was unveiled in Paris.
ON THIS DAY IN .. by Daily Post (Liverpool, England)
MARCH 2 1791: The optical telegraph (semaphore machine) was unveiled in Paris.
On This day by Coventry Evening Telegraph (England)
[ILLUSTRATION OMITTED] Although optical communication was first demonstrated in the 1790s with Claude Chappe's optical telegraph, and an artistic light-transmitting principle was used in the 1840s, the explosion of fiber optics during the last 20 years has created a network of information transmission at ever increasing speeds.
And then there as light: fiber optic is tomorrow's telecom solution by Kinder, Peri / Utah Business
 
 
 
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