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2. Siren (alarm) - Wikipedia

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

   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.

3. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   Sound sample ⓘ A civil defense siren is a siren used to provide an emergency population warning to the general population of approaching danger. Initially designed to warn city dwellers of air raids (air-raid sirens) during World War II, they were later used to warn of nuclear attack and natural disasters, such as tornadoes (tornado sirens).

4. Rumbler siren - Wikipedia

   en.wikipedia.org/wiki/Rumbler_siren

   Rumbler siren. A Rumbler siren is a type of emergency vehicle siren used primarily in the United States.Developed in 2007 by Federal Signal Corporation, and sounding at a low-frequency level, it is designed to be heard by motorists who may otherwise be unable to hear high-frequency sirens due to ambient noise, such as urban traffic.

5. Hear an outdoor emergency siren in the county? Here's ... - AOL

   www.aol.com/hear-outdoor-emergency-siren-county...

   According to Al "Buddy" Kirsits, director of the county's Emergency Management Agency, the sirens are more than just tornado sirens. "They're an early warning outdoor siren system," he said Monday.

6. List of sirens built by Alerting Communicators of America

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

   This siren is similar to Federal Signal's Thunderbolt series. Only a single unit remains in service in Milwaukee, WI. Screamers Electro-Mechanical 2, 5, 7.5, 10 8, 9, 9/12, 10/12 1968–1994 Omni Directional 102–115 dB at 100 ft. Series of small vertical sirens, comparable to Federal Signal Corporation's vertical sirens. Sentry 95

7. Emergency Broadcast System - Wikipedia

   en.wikipedia.org/wiki/Emergency_Broadcast_System

   These tapes contained scripted attack warnings, recorded siren sounds and other emergency information for use in the event of nuclear war. [ 6 ] [ 7 ] As official information began to emerge from various sources, non-primary stations were to broadcast it according to the following priority list: