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Encyclopedia Britannica



SEMAPHORE (Gr. oiva, sign, and (Popa, carrying, from &ea)

This article appears in Volume V24, Page 616 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SCY-SHA
SEMAPHORE (Gr. oiva, sign, and (Popa, carrying, from &ea) , to
bear
 ), the name of an apparatus or mechanical device by which information or messages can be signalled to a distance. It consists of movable arms or blades of
wood
 , worked by levers and affixed to a high post or pole. The most familiar semaphore is that used in railway signalling on the
block
  system, where the blade if
horizontal
  signifies danger, if dropped safety. Used with a code, the semaphore is still used in the navy for signalling
from ship to ship. Until the invention of the electric telegraph, the semaphore was used for transmitting messages over long distances.


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