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Semaphore line

From Simple English Wikipedia, the free encyclopedia

A semaphore line is an installation used to send optical signals. It is also known as optical telegraph. Common system include signal towers with special installations on them or hand-held flags. The meaning of the signal is determined by the position of the elements, for example the flags. The signal can be read when it is in a stable position. In modern usage, it refers to signalling with a set of flags.

Signal towers came before the electric telegraph. They were faster than sending out post riders with the information.

  • Optical telegraph of Claude Chappe on the Litermont near Nalbach, Germany.
    Optical telegraph of Claude Chappe on the Litermont near Nalbach, Germany.
  • Diagram of person holding 2 semaphore flags as letter "P"
    Diagram of person holding 2 semaphore flags as letter "P"
  • A Chappe semaphore tower near Saverne, France
    A Chappe semaphore tower near Saverne, France
  • A Chappe semaphore telegraph at Louvre, France
    A Chappe semaphore telegraph at Louvre, France

Characters

The following semaphore characters are presented as one would face the flagman:

  • Rest / Space
    Rest / Space
  • Numerals
    Numerals
  • Error
    Error
  • Cancel
    Cancel
  • A / 1
    A / 1
  • B / 2
    B / 2
  • C / 3Acknowledge
    C / 3
    Acknowledge
  • D / 4
    D / 4
  • E / 5
    E / 5
  • F / 6
    F / 6
  • G / 7
    G / 7
  • H / 8
    H / 8
  • I / 9
    I / 9
  • JLetters
    J
    Letters
  • K / 0
    K / 0
  • L
    L
  • M
    M
  • NNegative
    N
    Negative
  • O
    O
  • P
    P
  • Q
    Q
  • R
    R
  • S
    S
  • T
    T
  • U
    U
  • V
    V
  • W
    W
  • X
    X
  • Y
    Y
  • Z
    Z

Related articles

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Semaphore line
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