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The i-Force is an electronic siren made by ASC that comes in many different sizes (Sound Cells). Similar to Federal Signal's Modulator. E-Class Electronic none none 2002–Present Omni Directional dB rating depends on how many drivers. 400 watt speakers can be arranged in whichever pattern is needed. Very similar to ATI's HPSS omni-directional ...
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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.
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).
A siren was used in Bob Dylan's classic album, Highway 61 Revisited. One is also heard in Stevie Wonder's song "Sir Duke" just before the second chorus. Dan Zanes also uses a siren in his version of "Washington at Valley Forge." Acme is the trade name of J Hudson & Co of Birmingham, England, who developed and patented the Acme siren in 1895. It ...
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.
A siren disk is used in pneumatic sirens and has holes which are variously spaced apart. When the disk is spun in front of a jet of air, the holes modulate the air-jet which produces a sound. The pitch of a siren is produced by "the frequency of the impulses of compressed air passing through the openings in a rotating disk."