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  2. Rumbler siren - Wikipedia

    en.wikipedia.org/wiki/Rumbler_siren

    Rumbler siren. A Rumbler siren is a type of emergency vehicle siren used primarily in the United States.Developed in 2007 by Federal Signal Corporation, and sounding at a low-frequency level, it is designed to be heard by motorists who may otherwise be unable to hear high-frequency sirens due to ambient noise, such as urban traffic.

  3. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    Howler Electro-Mechanical 10 9/12 1972–1989 Rotating 123 dB at 100 ft. The Howler is a rotational version of the Screamer S-10. Extremely rare, only one left in ...

  4. Whelen Engineering Company - Wikipedia

    en.wikipedia.org/wiki/Whelen_Engineering_Company

    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.

  5. Federal Signal Modulator - Wikipedia

    en.wikipedia.org/wiki/Federal_Signal_Modulator

    The Modulator has a similar setup to the Whelen WPS 2700, 2800, 2900, and OmniAlert omnidirectional speaker arrays. The Whelen arrays have single driver cells, [3] while Modulators have multi-driver cells. The American Signal I-Force siren, which uses stacked, elliptical speaker cells that provide omnidirectional sound output, is also similar ...

  6. Modified racing - Wikipedia

    en.wikipedia.org/wiki/Modified_racing

    Modified stock car racing, also known as modified racing and modified, is a type of auto racing that involves purpose-built cars simultaneously racing against each other on oval tracks.

  7. Obama vs. Romney Electoral Map - The Huffington Post

    elections.huffingtonpost.com/2012/romney-vs...

    Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 277 electoral votes and Romney at 191. Obama vs. Romney Electoral Map

  8. National Register of Historic Places listings in Franklin ...

    en.wikipedia.org/wiki/National_Register_of...

    This is a list of the properties and districts on the National Register of Historic Places in Franklin County, Ohio, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in an online map. [6]

  9. Off-hook tone - Wikipedia

    en.wikipedia.org/wiki/Off-hook_tone

    Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.