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The Junkers Ju 87, popularly known as the "Stuka", [b] is a German dive bomber and ground-attack aircraft.Designed by Hermann Pohlmann, it first flew in 1935.The Ju 87 made its combat debut in 1937 with the Luftwaffe's Condor Legion during the Spanish Civil War of 1936–1939 and served the Axis in World War II from beginning to end (1939–1945).
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
This page was last edited on 20 February 2025, at 19:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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).
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. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines.
The Hurricane 130 was a supercharged electro-mechanical siren utilizing an air compressor to produce a high output similar to the Thunderbolt siren. It was available in dual tone 8/10, 10/12, 8/12 port, or single tone 8, 10, or 12 port configurations, most models however came equipped with an 8/10 chopper port ratio (similar to a Major Third ) .
The CLM Model 927XXDP siren (rotational CLM) is a 10/12 port rotating electromechanical siren, with a distinctive design featuring two unique horns. The decibel rating of the model is ~130 decibels. These sirens use Lincoln Electric 5 horsepower induction motors. This model of CLM is the most well-known and recognizable warning siren made by CLM.
The Federal Signal 3T22 was originally designed as the 2T22 in 1952 or 1954. The 2T22 has the same number of ports and cones. It can produce two main signals (it can produce more but the other signals are rarely used), hence the name "2T22" (the 2 at front representing the 2 choppers, and the 22 representing the amount of horns).