sabotage operations. Study of foghorns British writer Jennifer Lucy Allan was awarded a PhD by the University of the Arts London in 2019 for her thesis on Fog tropes : a social and cultural history of the foghorn and subsequently published a book: The Foghorn's Lament: the Disappearing Music of the Coast. See also Siren (alarm) Air horn References Further reading External links Listen to Golden Gate Bridge foghorn a list of foghorn clips from San Pedro, CA.- Foghorn 1 is a good example of a diaphone. Terry Pepper, Seeing the Light, "Fog Signal Technology." Location of foghorns that can still be heard in UK BBC Radio 4 - The Foghorn: A Celebration Association of Lighthouse Keepers: archive clips of a variety of fog signal sounds from around the UK Navigation Canadian inventions Navigational aids Lighthouse fixtures Sirens Maritime signalling