Civil defense siren - Wikipedia
网页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).
Federal Signal Thunderbolt - Civil Defense Sirens Wiki
网页The Thunderbolt was a long-running series of supercharged rotating sirens manufactured by Federal Signal, and over its nearly 40-year production run it gained a reputation as one of the most popular civil defense sirens ever produced, sporting nearly unrivaled sound output when it was released...
Federal Sirens - Civil Defense Museum
网页The Federal Thunderbolt siren was developed in the early 1950s specifically for civil defense warning use. The Thunderbolt was a unique design because it used a high power air pump (roots blower not a compressor) to force a high volume of low pressure air through the siren rotor (chopper) which kept the sound output of the siren at full volume ...
List of civil defense sirens - Wikipedia
网页Federal Signal sirens. Thunderbolt (siren) Federal Signal 3T22 / 2T22. Federal Signal Model 2. Federal Signal Modulator. Federal Signal STH-10.
Federal Signal SD-10 - Air Raid Sirens Wiki
网页2024年8月23日 · The SD-10 (Special Dual-Tone, 10-Horsepower) is an omnidirectional, electromechanical civil defense siren that was produced by Federal Signal. It was introduced in 1954 as a special-purpose dual-tone civil defense siren, as the Office of Civil Defense mandated that all sirens used for civil defense must be dual-tone.
Federal Signal STH-10 - Air Raid Sirens Wiki
网页2024年8月14日 · The STH-10 (Single Tone High, 10 Horsepower) is an omnidirectional electromechanical siren that was produced by Federal Signal over a span of 50 years. It proved to be one of the most popular of Federal Signal's omnidirectional sirens and gained a reputation as a reliable, effective multipurpose siren.
2001-130 Directional Rotating Siren | Federal Signal
网页The Federal Signal 2001-130 and Equinox sirens is a high power, warning, unidirectional outdoor rotating siren. The high-decibel output provides maximum coverage with minimum installation cost. Radio/cellular/satellite or wireless IP activation can further minimize installation costs by eliminating the need for leased dedicated control lines.
Warning Sirens - Civil Defense Museum
网页Sirens were long used before the cold war to signal warnings of air attack and many other uses but during the cold war virtually every city had a siren warning system to warn citizens of nuclear attack.
Model 2 Omni-Directional Siren - Federal Signal
网页Federal Signal’s Model 2 omni-directional siren is the most commonly used siren for fire station and industrial plant alerting. The omni-directional siren is an outdoor warning siren capable of producing intense warning signals over a large area.
Federal Signal XT22 | Civil Defense Sirens Wiki | Fandom
网页The XT22 (2 or 3 Tone, 22 horns/ports) sirens are dual rotor omnidirectional sirens that were produced by Federal Signal over a span of nearly 40 years, and included two sirens, the 2T22 and 3T22. These are some of the most well-known sirens, with a distinctive sound, and are still commonly found today.