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2. Foghorn - Wikipedia

   en.wikipedia.org/wiki/Foghorn

   All foghorns use a vibrating column of air to create an audible tone, but the method of setting up this vibration differs. Some horns, such as the Daboll trumpet, used vibrating plates or metal reeds, a similar principle to a modern electric car horn. Others used air forced through holes in a rotating cylinder or disk, in the same manner as a ...

3. Dorade box - Wikipedia

   en.wikipedia.org/wiki/Dorade_box

   The grey area indicates the deck of the boat. A dorade box (also called a dorade vent , collector box , cowl vent , or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.

4. 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 .

5. Horn (acoustic) - Wikipedia

   en.wikipedia.org/wiki/Horn_(acoustic)

   A patent horn loudspeaker. Loudspeakers are often built into horn-shaped enclosures or use horns. Most often the higher-frequency elements (tweeters and midranges) use horns, sometimes with acoustic diffraction lenses to spread the sound waves in a horizontal pattern at ear-level and limit the vertical pattern. An audio driver (e.g., a speaker ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. How old is too old to be shoveling snow? Adults over 45 may ...

   www.aol.com/old-too-old-shoveling-snow-110316945...

   The season for snowfall has already begun in several parts of the country, and one of the most laborious chores related to the winter weather is snow shoveling.. Though the task may just be ...