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  2. Air horn - Wikipedia

    en.wikipedia.org/wiki/Air_horn

    An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, ...

  3. Train horn - Wikipedia

    en.wikipedia.org/wiki/Train_horn

    Diagram of a typical locomotive air horn power chamber, showing operation. Train horns are operated by compressed air, typically 125–140 psi (8.6–9.7 bar), and fed from a locomotive main air reservoir. When the engineer opens the horn valve, air flows through a supply line into the power chamber at the horn's base (diagram, right).

  4. Velocity stack - Wikipedia

    en.wikipedia.org/wiki/Velocity_stack

    Short velocity stacks on a 302 cu.in. Ford FE engine in the tight confines of a Ford GT-40. A velocity stack, trumpet, or air horn [1] is a typically flared, parallel-sided tubular device fitted individually or in groupings to the entry of an engine's air intake system to smooth high speed airflow, and allow engine intake track tuning to incorporate pressure pulses created by its internal ...

  5. Train whistle - Wikipedia

    en.wikipedia.org/wiki/Train_whistle

    A train whistle or air whistle (originally referred to as a train trumpet or air trumpet) is an audible signaling device on a steam or gas locomotive, used to warn that the train is approaching, and to communicate with rail workers. Modern diesel and electric locomotives primarily use a powerful air horn instead of a whistle as an audible ...

  6. Foghorn - Wikipedia

    en.wikipedia.org/wiki/Foghorn

    All foghorns use a vibrating column of air to create an audible tone, but the method of setting up this vibration differs. Some horns, such as the Daboll trumpet, used vibrating plates or metal reeds, a similar principle to a modern electric car horn. Others used air forced through holes in a rotating cylinder or disk, in the same manner as a ...

  7. NYPD cracks down on airhorns, confetti as ‘stupid and ... - AOL

    www.aol.com/news/nypd-cracks-down-airhorns...

    More cowbell sure, but no more airhorn! The NYPD is banning the blaring, celebratory airhorns that families and friends of police officers have been loudly blasting at promotional ceremonies, The ...

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