Diaphone
From Wikipedia, the free encyclopedia
For the organ pipe, see Diaphone pipes. For the linguistic term, see Diaphoneme. For the Noctuidae moth species, see Diaphone (moth).
The diaphone is a noisemaking device best known for its use as a foghorn: It can produce deep, powerful tones, able to carry a long distance. Although they have fallen out of favor, diaphones were also used at some fire stations and in other situations where a loud, audible signal was required.