The air horn is a device designed to create an extremely loud noise. It is usually composed of a pressurized air source coupled to a horn through a
valvewhich allows the device to be turned on and off. Air horns have been installed on large semi-trailer trucks, fire trucks, and some ambulances for many years. It is also used on trains as a warning device, and on ships as a signalling device.
Many fire trucks, ambulances, and other large emergency vehicles operate air horns as a means of warning vehicles to clear the right-of-way. These may include traditional "truck" style air horns, or stuttertone air horns, which produce an easily recognizable tone. Many US firetrucks have stuttertone air horns installed.
There are also electronic varieties of "air horns" for emergency vehicles, which produce a similar easily-recognizable sound. These are typically integrated into the same system as the vehicle's electronic siren, and sound through the same speakers. There are also air-horn only systems available, which some states allow for use by volunteers in their personal vehicles.
Trucks and Trains
More recently, some individuals are adding truck air horns (and even louder
train horns that sound a minor-seventh chord rather than the major chord of truck horns) to their personal autos as a hobby or addition to the culture of bigness exemplifed by SUVs. It should be noted that the use of a train whistle in an automobile could cause an accident. Some jurisdictions do not even allow an airhorn to be attached, whether or not it can be activated.Fact|date=June 2007
Original diesel locomotives were equipped with truck horns. After an accident in which a drivermistook a train for a truck, the need for a unique train horn became clear [http://utubc.com/meeting/meeting30.htm] . Consequently, North American trains now have at least two "horns" forming the airhorn, that sound simultaneously, creating a chord. Three and five-tone configurations are the most common, but two-tone configurations also exist [http://www.dieselairhorns.com/collection.html] . At a
grade crossing, the usual sequence is two longs, one short, and one long, except in locations where airhorns are not allowed to sound due to quiet ordinances. Train mounted airhorns are called train whistles or air chimes.
A list of air horns used on various railroads with audio samples can be found [http://atsf.railfan.net/airhorns here]
It is a common game among schoolchildren (especially on
field trips, which are more likely to involve travel on a major highway) riding a school busto pump their fists, imitating the motion of a truck driver operating an air horn, in order to request that passing drivers sound their horns. If the driver obliges, the passengers will generally respond with great amusement, sometimes despite chastisement. Such chastisement is more likely to come from teachers or fellow students, as bus drivers are generally used to distractions. Air horns are also sometimes used as retaliation toward telemarketersor other harassing callers to deter future calls.
The airhorn is also a popular sample in reggae music. Jamaican dancehall music is the first musical genre to use the effect, and been using the airhorn sample for over 26 years, in live shows as well as on mixtape recording. The effect has recently been used by hip hop mixtapes as well as
reggaeton, a reggae hybrid genre.
In recent years it has become a fad for car and truck enthusiasts to install large air horns on their vehicles [cite web|url=http://www.wesh.com/newsarchive/6845424/detail.html|title=WESH.com New Horns Make Cars Sound Like Trains|accessdate=2008-05-20] . A popular web series called "Terror On The Streets" depicts drivers of such vehicles startling unsuspecting pedestrians while driving through urban areas [http://video.google.com/videosearch?q=terror+on+the+streets] . Even police officers are not immune to these audio assaults and are shown being startled while on duty.
In "Arrested Development", Buster blows an air horn and his mother refers to it as her "rape horn."
Jackass The Movie", one stunt involved blasting an air horn at unsuspecting golfers.
The rock band, Oppenheimer [cite web|url=http://oppenheimermusic.co.uk|title=Oppenheimermusic.co.uk] , has become famous for their legendary Air Horn solos which are incorporated into all of their shows.
Portable or personal air horns
Portableair horns are also readily available, utilizing a small aerosol spraycan as the air source. These are often present at sporting events such as football, hockeyand soccer, and at other outdoor events. Small versions are sometimes used as bicycle horns.
In the Jackass television series and movies, air horns are occasionally used to frighten people. Many people amuse themselves by driving around blasting air horns at others, or using them in other ways.
Youtubehas many videos about such events. A very common and popular undertaking with the air horn is the accordingly named "golf course airhorn", where the Jackass team blows an airhorn just as an unsuspecting golfer is coming down with their swing.
Some people use air horns to deter prank callers. Fact|date=June 2008Those who receive harassing calls may sound off an air horn instead of saying "hello" to make it less desirable for the caller to call back. Fact|date=June 2008
The airhorn has also had a large role in ice hockey, especially in the
NHL. There are normally two horns; a small high one that announces the end of the period, and a much louder, lower horn that is sounded when the home team scores and/or wins the hockey game.Fact|date=June 2008
Some air horns are used for signaling the end of the period or quarter on scoreboard systems. Although not technically air, the Federal 55 (used in these applications) is an electric horn which uses a coil to move a diaphragm, in turn, causing the diaphragm to resonate a column of air , which produces the musical note you hear. Notably, most arenas use two horns, although by themselves the horn can achieve sound pressure levels of 106DB. These horns are used over the standard Federal 350 horn (used on high school and smaller gym scoreboards) so that the signal can be heard over fans, the band, and other noise at sporting events by officials. "Federal" is Federal Signal Corporation of Illinois.
Wikimedia Foundation. 2010.
Look at other dictionaries:
air horn —  The upper part of a carburetor into which the air is drawn. The choke butterfly is located in this air horn.  It is also a term used for a warning horn which is operated by forcing compressed air through a reed … Dictionary of automotive terms
air horn — noun 1. a pneumatic horn • Hypernyms: ↑horn 2. air intake of a carburetor • Hypernyms: ↑intake, ↑inlet • Part Holonyms: ↑carburetor, ↑carburettor * * * … Useful english dictionary
air horn — /ˈɛə hɔn/ (say air hawn) noun a horn activated by a pressurised air source, used on large vehicles such as trucks, fire engines, etc … Australian English dictionary
air horn — a horn activated by compressed air. Also, airhorn. * * * … Universalium
air horn baffle — Used on some Rochester Quadrajet carburetors to prevent incoming air from forcing fuel into the secondary wells through the bleed tubes. Prevents secondary nozzle lag during heavy acceleration … Dictionary of automotive terms
Horn (acoustic) — A horn is a tapered sound guide designed to provide an acoustic impedance match between a sound source and free air. This has the effect of maximising the efficiency with which sound waves from the particular source are transferred to the air.… … Wikipedia
horn — A device for sounding an alarm. On some entry level vehicles, a single horn makes a high pitch beep. On more expensive vehicles, the sound is made with two or more horns. The sound is made by an electrical charge which activates and deactivates a … Dictionary of automotive terms
horn — I (New American Roget s College Thesaurus) n. antler, cornu, callus, nail; saddle horn, pummel, pommel; blower, tooter, tin horn, ram s horn, shofar, French horn, trumpet, etc. (see music); horn of plenty, cornucopia; powder horn. See hardness,… … English dictionary for students
Horn & Hardart — is a company that came to prominence as the proprietor of the first automat in New York City. German born Frank Hardart and Philadelphia s Joseph Horn opened their first restaurant together in Philadelphia on December 22, 1888. The vest pocket… … Wikipedia
Air raid — refers to an attack by aircraft against ground targets. The term is generally used for strategic bombing attacks, while airstrike is used for smaller tactical attacks.WarAttack*Bombing of Guernica (April 26, 1937), the first air attack aimed at… … Wikipedia