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In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
Public warning system siren in Dresden, Germany. An emergency population warning, or public warning system is a method where by local, regional, or national authorities can contact or notify members of the public to warn them of an impending emergency. These warnings may be necessary for a number of reasons, including:
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Learn more about the AOL app and download it from the App Store. The AOL app is available for iOS devices running iOS 12 or newer. 1. Open the App Store on your device. 2. Tap the Search icon. 3. Type "AOL" in the search field. 4. Tap Search. 5. Next to AOL: News Email Weather Video, tap Get. 6. Enter your Touch ID or Apple ID, if prompted. 7 ...
The Standard Emergency Warning Signal (SEWS) is a warning siren used in Australia to alert the public of danger. The siren is played over radio, television or public address systems in public places to warn of bushfire , flood , cyclone , tsunami , earthquake or terrorist attack .
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The alert system is intended to allow government and the emergency services to send a text alert to mobile phones in a situation where there is perceived to be an immediate risk to life. Mobile users will receive an alert accompanied by a siren-like noise, they must acknowledge in order to use the phone's other features.