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A klaxon is a type of an electromechanical horn or alerting device. Mainly used on cars, trains and ships, it produces an easily identifiable sound, often transcribed onomatopoeically in English as "awooga". Like most mechanical horns, it has largely been replaced by solid-state electronic alarms, though the memorable tone has persisted.
Car alarms work by emitting high-volume sound (often a vehicle-mounted siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination of these) when the conditions necessary for triggering it are met. Such alarms may also cause the vehicle's headlights to flash, may notify the car's owner of the incident via a paging ...
In most horns it also determines the pitch of the sound. When vibrated by the diaphragm, the column of air in the horn vibrates in standing waves. The length of the horn determines the wavelength of the sound waves generated, and thus the fundamental frequency (pitch) of the note produced by the horn. The longer the horn, the lower the pitch.
Train horns are sounded where a whistle post (marked with the letter "S" for siffler – "to whistle") is present. If the whistle post is labelled "J" (meaning jour – "day"), the horn is only to be sounded between 07:00 and 20:00. Horns must also be sounded when passing an oncoming train, and shortly before reaching the last car of the train.
City officials have for years debated spending millions to create quiet zones where trains don’t sound their horns as they pass railroad crossings. Train horns might finally be silenced in parts ...
In Germany and some other European countries, the pneumatic two-tone (hi-lo) siren consists of two sets of air horns, one high pitched and the other low pitched. An air compressor blows the air into one set of horns, and then it automatically switches to the other set. As this back and forth switching occurs, the sound changes tones.
Electrical Klaxon horn in 1910. Hutchison was concerned with increased automobile traffic in New York City. An early version of a vehicle speed alarm was not readily adopted. [12] Warning devices at the time were either bells or horns essentially derived from musical instruments. He realized that a more obnoxious sound would serve as a better ...
Oakland, California, residents are unnerved and some say they are moving out of state after a rise in violent crime that has community activists, including the local NAACP members, demanding ...
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