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  2. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    A similar siren system in Carstairs, Scotland, called the Carstairs Hospital Siren System, uses 9 sirens, 7 of them being Secomak CS8, 1 being a Klaxon GP8 and 1 being Secomak GP12. The hi-lo signal is rarely used since during emergencies, they sound a continuous tone for 8 minutes and in all clear, they sound a long wail, consisting of 30 ...

  3. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ An 1860s-era siren. [2] A siren is a loud noise-making device. There are two general types: mechanical and electronic. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks.

  4. Emergency vehicle equipment in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle...

    This usage is colloquially known as "blues and twos", which refers to the blue lights and the two-tone siren once commonplace (although most sirens now have a range of tones like Wail, Yelp, Phaser, and Hi-Lo). A call-out requiring the use of lights and sirens is often colloquially known as a "blue light run".

  5. Belfast siren: Mystery noise caused by small Harbour Estate fire

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  6. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    1 5/6 Sometime around the late 60s/early 70s. Omni Directional 95 dB at 100 ft. Very rare siren. Dual tone circular port siren. 95 dB at 100 ft. Manufactured by Klaxon, sold in USA under ACA name. Eight are known to exist, all under the Klaxon SS6 model. None exist under the Sentry 95 branding or model. SuperBanshee/Banshee 120 Electro-Mechanical

  7. Federal Signal Modulator - Wikipedia

    en.wikipedia.org/wiki/Federal_Signal_Modulator

    The Modulators in Chicago's siren system formerly used to run on the Alternate Wail tone during tornado warnings in order to vary from emergency vehicle sirens. However, in O'Hare International Airport, instead of using the main UV Wail or Attack, they use an Eclipse 8 (possibly) sound card doing attack. Before that is the Westminster Chimes ...

  8. List of civil defense sirens - Wikipedia

    en.wikipedia.org/wiki/List_of_civil_defense_sirens

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  9. Doctors Say This Type Of Noise Is Best For Deep Sleep - AOL

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    Small and easily portable, this sound machine includes three sound options so you can find the right fit for you: bright white noise, deep white noise, and gentle surf. $19.99 at Amazon Restore 2 ...