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Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 2025. This is a list of onomatopoeias, i.e. words that imitate, resemble, or suggest the source of the sound that they describe. For more information, see the linked articles. Human vocal sounds Achoo, Atishoo, the sound of a sneeze Ahem, a sound made to clear the throat or to draw attention ...
An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder.
In 1826, on Lake Geneva, they measured the elapsed time between a flash of light and the sound of a submerged ship's bell heard using an underwater listening horn. [3] They measured a sound speed of 1435 metres per second over a 17 kilometre (km) distance, providing the first quantitative measurement of sound speed in water. [4]
Noise generated on board ships and submarines can have far-reaching effects on the ability of the vessel to operate safely and efficiently. Military vessels in particular need to be quiet to avoid detection by sonar , so many methods have been used to limit a vessel's noise signature.
OpenSeaMap sea chart showing a port buoy and a west cardinal, an indicator for a sound signal and the label Bell [4] A bell buoy is a floating sea mark with a bell that is made to sound by the swell. It belongs to the sound buoys and by shape to the beacon buoys. [5] [6] In nautical charts, bell buoys are designated Bell. The development of ...
Machines and their sounds are also often described with onomatopoeia: honk or beep-beep for the horn of an automobile, and vroom or brum for the internal combustion engine. In speaking of a mishap involving an audible arcing of electricity, the word zap is often used (and its use has been extended to describe non-auditory effects of interference).
As well as providing demonstrations by playing brief pieces of music without touching the instrument, often confounding his audience, he also produced sound effects such as imitations of an airplane take-off and a ship's horn blast. [3]
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