Online Encyclopedia

SEMAPHORE (Gr. oiva, sign, and (Popa,...

Online Encyclopedia
Originally appearing in Volume V24, Page 616 of the 1911 Encyclopedia Britannica.
Spread the word: it!
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.
End of Article: SEMAPHORE (Gr. oiva, sign, and (Popa, carrying, from &ea)

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.