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  2. Air horn - Wikipedia

    en.wikipedia.org/wiki/Air_horn

    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. The flaring horn ...

  3. Megaphone - Wikipedia

    en.wikipedia.org/wiki/Megaphone

    Handheld versions are shaped generally like the old acoustic megaphone, with a microphone at one end and a horn speaker at the other, and a pistol grip on the side, with a trigger switch to turn it on. In use, the device is held up to the mouth, and the trigger is pressed to turn it on while speaking.

  4. Sign of the horns - Wikipedia

    en.wikipedia.org/wiki/Sign_of_the_horns

    A fan displays the Hook 'em Horns during a Texas football game versus Arkansas. Hook 'em Horns is the slogan and hand signal of the University of Texas at Austin (UT). Students and alumni of the university employ a greeting consisting of the phrase "Hook 'em" or "Hook 'em Horns" and also use the phrase as a parting good-bye or as the closing ...

  5. Vuvuzela - Wikipedia

    en.wikipedia.org/wiki/Vuvuzela

    Makarapa — hand-made hats worn by spectators to show their team support; Portable or personal air horns — produce sounds similar to the vuvuzela; Football rattle — a percussion instrument which produces a clicking and rattling noise; Thundersticks — narrow plastic balloons used as promotional noise makers

  6. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    LRAD devices include hand-held devices, as well as those mounted on helicopters, motor vehicles and ships. [5] The parameter "ka", which is the wave number multiplied by the speaker radius, is often used to characterize sound source directivity. For this source, ka=19 at 2.5 kHz, and according to the LRAD data sheet, the beam angle of about 30 ...

  7. The 7 Best Handheld Vacuums for Small Spaces - AOL

    www.aol.com/lifestyle/7-best-handheld-vacuums...

    These 7 small-but-mighty vacuums from brands like Dyson, Hoover, and Black+Decker making cleaning small spaces easy.