Lighthouse fixtures

compact composite lens

thumb|right|Two roof-mounted diaphone foghorns at [[Split Rock Lighthouse]] 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 often used in relation to marine transport. When visual navigation aids such as lighthouses are obscured, foghorns provide an audible warning of rock outcrops, shoals, headlands, or other dangers to shipping.

Type of oil lamp

description of navigational light

oil lamp with a clockwork pump mechanism

automatic controlled acetylene gas lighthouse

obsolete Fresnel lens used in lighthouses