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The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder. Air horns are widely employed as vehicle horns , installed on large buses , semi-trailer trucks , fire trucks , trains , and some ambulances as a warning device, and on ships as a signaling device.
A small industrial siren. These used smaller horns than the others. They had one 100 watt driver per horn (AL-1000) or two 100 watt drivers per horn (AL-2000). Horns could be removed for uni-directional applications. AL-4000/AL-6000/AL-8000 Electronic none none 1984-1995 Omni/uni Directional dB rating depends on model.
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.
The Chrysler Air Raid Siren is an outdoor warning siren produced during the Cold War era that has an output of 138 dB(C) at 100 feet. It was known as the Chrysler Bell Victory Siren during its first generation, which was between the end of World War II and the fall of the Berlin Wall. It is reputed to be the loudest air raid siren ever produced ...
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.
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