semaphore arm

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• Semaphore line — This article is about the communication system using towers with pivoting shutters. For other uses, see Semaphore (disambiguation). For the now closed railway in Adelaide, Australia, see Semaphore railway line, Adelaide. A Chappe telegraph at… …   Wikipedia

• semaphore — /ˈsɛməfɔ / (say semuhfaw) noun 1. an apparatus for conveying information by means of signals. 2. a system of signalling by hand, in which a flag is held in each hand at arm s length in various positions. –verb (semaphored, semaphoring) –verb (t)… …  

• semaphore — n. & v. n. 1 Mil. etc. a system of sending messages by holding the arms or two flags in certain positions according to an alphabetic code. 2 a signalling apparatus consisting of a post with a movable arm or arms, lanterns, etc., for use (esp. on… …   Useful english dictionary

• Railway semaphore signal — One of the earliest forms of fixed railway signal is the semaphore. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted arm . Semaphore signals were patented in the early 1840s by… …   Wikipedia

• Flag semaphore — is a system for conveying information at a distance by means of visual signals with hand held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a …   Wikipedia

• Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …   Wikipedia

• UK railway signalling — The railway signalling systems used across the majority of the United Kingdom rail network use lineside signals to advise the driver of the status of the section of track ahead. Most lineside signals are in colour light form, but a significant… …   Wikipedia

• Traffic Control — ➡ law enforcement * * * Introduction       supervision of the movement of people, goods, or vehicles to ensure efficiency and safety.       Traffic is the movement of people and goods from one location to another. The movement typically occurs… …   Universalium

• Letter box — This article is about boxes for depositing letters. For video framing, see letterbox. For the type of interprocess communication, see MailSlot . A letter box, letterbox, letter plate, letter hole, mail slot, or mailbox is a receptacle for… …   Wikipedia

• Pedestrian crossing — Crosswalk redirects here. For other uses, see Crosswalk (disambiguation). An adult and child prepare to use a crosswalk in Haifa, Israel …   Wikipedia

• Maritime history of California — History of California This article is part of a series Timeline …   Wikipedia