Others used air forced through holes in a rotating cylinder or disk, in the same manner as a siren. Some horns, such as the Daboll trumpet, used vibrating plates or metal reeds, a similar principle to a modern electric car horn. When visual navigation aids such as lighthouses are obscured, foghorns provide an audible warning of rock outcrops, shoals, headlands, or other dangers to shipping.Īll foghorns use a vibrating column of air to create an audible tone, but the method of setting up this vibration differs. ![]() ![]() The term is most often used in relation to marine transport. Building housing the two diaphone foghorns at Split Rock Light.Ī 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.
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