Editing Flag signals (section)

==Semaphore==
[[Flag semaphore]] signalling uses two flags, held in specific positions to signify letters. This method requires simple equipment but can be obscured by bad weather. A permanently installed chain of semaphore stations is a [[semaphore line]] and before the invention of the electric telegraph, was the fastest means of communication over moderately long distances. <ref>{{Cite web|url=https://www.bbc.com/news/magazine-22909590|title=How Napoleon's semaphore telegraph changed the world|first=Hugh|last=Schofield|work=BBC News |date=June 17, 2013}}</ref>{{BSN|date=February 2019}}