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2. Air horn - Wikipedia

   en.wikipedia.org/wiki/Air_horn

   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.

3. Velocity stack - Wikipedia

   en.wikipedia.org/wiki/Velocity_stack

   Short velocity stacks on a 302 cu.in. Ford FE engine in the tight confines of a Ford GT-40. A velocity stack, trumpet, or air horn [1] is a typically flared, parallel-sided tubular device fitted individually or in groupings to the entry of an engine's air intake system to smooth high speed airflow, and allow engine intake track tuning to incorporate pressure pulses created by its internal ...

4. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   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.

5. Train whistle - Wikipedia

   en.wikipedia.org/wiki/Train_whistle

   A train whistle or air whistle (originally referred to as a train trumpet or air trumpet) is an audible signaling device on a steam or gas locomotive, used to warn that the train is approaching, and to communicate with rail workers. Modern diesel and electric locomotives primarily use a powerful air horn instead of a whistle as an audible ...

6. Nutritional supplements and vitamins are more popular than ...

   www.aol.com/nutritional-supplements-vitamins...

   Dietary supplements — vitamins, minerals, botanicals and probiotics — are more popular than ever. More than three-quarters of Americans take at least one, according to the Food and Drug ...

7. FAA announces temporary restrictions on drone flights in New ...

   www.aol.com/faa-announces-temporary-restrictions...

   The Federal Aviation Administration issued temporary flight restrictions prohibiting drone flights over parts of New Jersey following an influx of sightings in recent weeks.. The notice, which ...

8. Prince William pens personal birthday message to wife Kate ...

   www.aol.com/prince-william-pens-personal...

   Catherine, Princess of Wales, turns 43 on Jan. 9 and received a sweet message from her husband, Prince William. “To the most incredible wife and mother. The strength you’ve shown over the last ...

9. Vehicle horn - Wikipedia

   en.wikipedia.org/wiki/Vehicle_horn

   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.