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8/8, 8/10, 8/12, 10/10, 10/12, 12/12 1967-1972 (square horn) 1972-1981 (round horn) Rotating 130 dB at 100 ft. Started off using a direct drive 25HP Roots blower with a square horn, redesigned to a belt drive 30 HP blower with round horn. All known recordings are 8/10 port ratio. This siren is similar to Federal Signal's Thunderbolt series ...
An air horn consists of a flaring metal or plastic horn or trumpet (called the "bell") attached to a small air chamber containing a metal reed or diaphragm in the throat of the horn. Compressed air flows from an inlet line through a narrow opening past the reed or diaphragm, causing it to vibrate, which creates sound waves .
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. Its sound power varies, but could get as high as approximately 125 dB, depending on the compressor and the horns.
Federal Signal Model 5 in Ballston Spa, New York, U.S.. Sirens are sometimes integrated into a warning system that links sirens with other warning media, such as the radio and TV Emergency Alert System, NOAA Weather Radio, telephone alerting systems, Reverse 911, Cable Override, and wireless alerting systems in the United States and the National Public Alerting System, Alert Ready, in Canada.
The horns became an issue within the past few years. At a Nov. 27 promotion ceremony, the horns were blown so loudly that nothing else could be heard, another police officer said.
György Ligeti's opera Le Grand Macabre features two "Car Horn Preludes" scored for 12 bulb horns, each one tuned to a specific pitch. [12] The hornophone consists of a set of bulb horns tuned to a chromatic scale and arranged as a musical keyboard on a frame like a xylophone. The klaxophone is a similar musical instrument using a set of klaxons.
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