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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
The Whelen Company is divided into four divisions and has a subsidiary called Whelen Motorsports.. The four divisions of the company are as follows: The Automotive Division — provides lightbars, dashlights, strobe kits, siren boxes, and other public warning systems to be mounted on or within vehicles, [3] rotating sirens, and student alert systems with voice broadcast capability.
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.
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 remaining sirens are a mix of older motor driven models (usually from World War II), such as the Carter siren manufactured by Carter's of Nelson or the "syren" manufactured by Gent's of Leicester, and Cold War like Castle Castings and Secomak (now Klaxon Signal Co.) and newer electronic sirens like Hormann ECN, Whelen, Federal Signal ...
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 ) .
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And there are sirens of other sorts used musically, for example the two electric sirens used by Edgard Varèse in Ionisation (1929–1931) and the factory siren used by Dmitri Shostakovich in Symphony No. 2 (1927) (but Shostakovich's siren part is nowadays often played by the brass section using their standard instruments).