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  2. Semaphore - Wikipedia

    en.wikipedia.org/wiki/Semaphore

    Sailor with signal lamp. A signal lamp is a semaphore system using a visual signaling device, often utilizing Morse code. In the 19th century, the Royal Navy began using signal lamps. In 1867, then Captain, later Vice Admiral, Philip Howard Colomb for the first time began using dots and dashes from a signal lamp. [6]

  3. Railway semaphore signal - Wikipedia

    en.wikipedia.org/wiki/Railway_semaphore_signal

    The British semaphore signal arm consists of two parts: A wooden or metal arm (or "blade") which pivots at different angles, and a spectacle holding coloured lenses which move in front of a lamp in order to provide indications at night. Usually these were combined into a single frame, though in some types (e.g. "somersault" signals in which the ...

  4. North American railroad signals - Wikipedia

    en.wikipedia.org/.../North_American_railroad_signals

    Position light signals use rows of 5 + 3 ⁄ 8-inch-diameter (140 mm) lamps to simulate the positions of an upper quadrant semaphore blade. Position lights were developed by A.H. Rudd, Superintendent of Signalling of the Pennsylvania Railroad (PRR).

  5. Optical telegraph - Wikipedia

    en.wikipedia.org/wiki/Optical_telegraph

    There are two main types of such systems; the semaphore telegraph which uses pivoted indicator arms and conveys information according to the direction the indicators point, and the shutter telegraph which uses panels that can be rotated to block or pass the light from the sky behind to convey information.

  6. Signal lamp - Wikipedia

    en.wikipedia.org/wiki/Signal_lamp

    Signal lamp training during World War II. A signal lamp (sometimes called an Aldis lamp or a Morse lamp [1]) is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice by Captain Philip Howard Colomb, of the Royal Navy ...

  7. International Code of Signals - Wikipedia

    en.wikipedia.org/wiki/International_Code_of_Signals

    Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most recent evolution of a wide variety of maritime flag signalling systems.

  8. Railway signal - Wikipedia

    en.wikipedia.org/wiki/Railway_signal

    The invention of the electric light, which could be made brighter than oil lamps and hence visible both by night and day, resulted in the development of position light signals and colour-light signals at the beginning of the 20th century, [11] which gradually displaced semaphores. [12]

  9. UK railway signalling - Wikipedia

    en.wikipedia.org/wiki/UK_railway_signalling

    A British Upper Quadrant semaphore signal. In the days of the first British railways, "policemen" were employed by every railway company. Their jobs were many and varied, but one of their key roles was the giving of hand signals to inform engine drivers as to the state of the line ahead. [3]