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semaphore
(redirected from Optical telegraph)

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.03 sec.
See: indicator


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? Mentioned in ? References in periodicals archive
 
In response, the suspended mercury ion flashed on and off at irregular intervals, acting like an optical telegraph.
Semaphore functions as a kind of slow-motion magnifier for digital communications, and for me it connects with early visible communications technologies like the optical telegraph and semaphore flags.
 
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