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These sirens, mostly built by Carter, Gents, Castle Castings, and Secomak (now Klaxon Signal Co.), have 10 and 12 ports to create a minor third interval (B ♭ and D ♭ notes) and are probably the world's most recognised World War II air raid siren sound. Recordings of British sirens are often dubbed into movies set in countries which never ...
A British air raid siren from the Second World War. All clear is the signal, generally given by an air raid siren, which indicates that an air raid or other hazard has finished and that it is safe for civilians to leave their shelters; it is commonly used in radios as well.
San Francisco, California - This system is unique featuring the sound of the decommissioned Federal Signal STL-10 sirens that the HPSS units replaced; Casitas Dam, Ventura, California - This system is unique as they look like the Federal Signal Directional Speaker Array (DSA) sirens, but can have 7–8 speakers per stack, and gray caps on the speaker cones.
The Chrysler Air Raid Siren is an outdoor warning siren produced during the Cold War era that has an output of 138 dB(C) at 100 feet. It was known as the Chrysler Bell Victory Siren during its first generation, which was between the end of World War II and the fall of the Berlin Wall. It is reputed to be the loudest air raid siren ever produced ...
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.
Sound Output and Type Notes BN52 - BN54 Gas-Mechanical 25 8 1942–1953 Rotating 125 dB at 100 ft. The first version of the Mobil Directo which used a 25HP Wisconsin air-cooled engine. BN44E Electro-Mechanical 10 8, 10/12 1948–1967 Rotating 124 dB at 100 ft. The second version of the Mobil Directo which used a 10HP electric motor.
Download QR code; Print/export ... (siren) Federal Signal 3T22 / 2T22 ... Federal Signal STH-10; Other. Chrysler Air-Raid Siren; Sentry Siren; SiraTone This page was ...
Hull was the target of the first daylight raid of the war and the last piloted air raid on Britain. [1] Of a population of approximately 320,000 at the beginning of the war, approximately 152,000 were made homeless as a result of bomb destruction or damage. [3] Overall almost 1,200 people were killed and 3,000 injured by air raids. [4]