Semaphore line

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A Chappe telegraph at Louvre, France

A semaphore telegraph, optical telegraph, shutter telegraph chain, Chappe telegraph, or Napoleonic semaphore is a system of conveying information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position. These systems were popular in the late 18th to early 19th century. In modern usage, "semaphore line" and "optical telegraph" may refer to a relay system using flag semaphore, and "optical telegraph" may refer to a heliograph (optical telegraphy using mirror-directed sunlight reflections).

• See also: Wikipedia

• Related: Aldis lamp, Flag semaphore, Heliograph, Railway signalling, Signal lamp, Telegraph Hill

Chappe's semaphore Chappe's semaphore people.deas.harvard.edu/.../chappe.html - Web

Webpage including a map of England's telegraph cha... Webpage including a map of England's telegraph chains www.vauxhallandkennington.org.uk/telegraph.shtml - Web

Diagrams and maps of Murray's U.K. semaphore stati... Diagrams and maps of Murray's U.K. semaphore stations www.portsdown-tunnels.org.uk/ancient_sites/telegraph_p1.html - Web

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Photo and diagrams of Popham's U.K. semaphore stat... Photo and diagrams of Popham's U.K. semaphore stations www.portsdown-tunnels.org.uk/ancient_sites/telegraph_p2.html - Web

Map of visual telegraph (semaphore) and electrical... Map of visual telegraph (semaphore) and electrical telegraph lines in Italy, 1860 (in Italian) www.morsekey.net/duesicilie.html - Web

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