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Thus, an outstretched hand reaching upward and pumping is a signal to the driver of an air horn equipped vehicle, requesting a toot. In modern trucks and buses, the horn is actuated by a button on the steering wheel (just like a normal car horn). Some trucks and buses have both electric and air horn, selectable by a switch on the dashboard.
Acoustic horns are used in: horn loudspeakers; brass and woodwind musical instruments; vehicle horns such as those used on cars, trucks, trains, boats, and bicycles; megaphones, often used by lifeguards at public swimming pools. foghorns, used to warn ships; ear horns, used by people who are hard of hearing (the human ear itself having the form ...
To distinguish their sound from truck and bus air horns, train horns in the U.S. consist of groups of two to five horns (called "chimes") which have different notes, sounded together to form a chord. In Japan , most modern trains like 209 series or E233 series from the first half of the 1990s onwards use electric horns as primary in passenger use.
Cambodian Prime Minister Hun Manet has ordered a ban on musical horns, after videos posted on social media showed people dancing on roads and roadsides as passing trucks blasted rhythmic little tunes.
Prior to the early 1950s, locomotives were equipped with air horns that sounded a single note. Swanson sought to develop an air horn which would mimic the sound of a classic steam whistle. Using ancient Chinese musical theory, Swanson produced the six-note model 'H6'. This was impractical for railroad use, due to its relatively large size.
(M standing for "Modulation") Both the 3-chime and the 5-chime had all power chambers on an even plane, and the M5 eliminated the air tubing, instead using a manifold that internally supplied the air to all 5 (or 3) bells. The M5 is still to this day considered by historians and collectors as the most musical of all locomotive air horns.