Foghorn
Videos
A foghorn or fog signal is a device that uses sound to warn vehicles of navigational hazards such as rocky coastlines, or boats of the presence of other vessels, in foggy conditions. The term is most
Two roof-mounted diaphone foghorns at Split Rock Lighthouse
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
Fog siren at the Lizard Lighthouse, Cornwall
Air horn
Videos
An air horn is a pneumatic device designed to create a loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diap
Foghorn
…most older foghorn installations have been removed to avoid the need to run their complex machinery and replaced with electrically powered diaphragm or compressed air horns. Activation is completely automated: a laser or photo beam is shot out to sea and if the beam reflects back to the source (i.e. the laser beam is visible…
Steam whistle from a supertanker, in Merseyside Maritime Museum, United Kingdom
Diagram of a typical locomotive air horn power chamber, showing operation
Leslie model S5T five-chime locomotive air horn.
A small portable air horn used for sporting events, boating, or safety, powered by a can of compressed gas. It is operated by pressing a button on the top.