A low-pitched fog signal operated by compressed air, characterized by the “grunt” that ends each note.
More example sentences
- In later years the oscillator was replaced by a duplicate diaphone to be used in the event of breakdown.
- Use of the diaphones was limited after some lawsuits were filed against the Borough by nearby residents.
- In 1991 the diaphone fog signal was changed to an electric horn retaining the same character.
early 20th century: from Greek dia 'through' + phōnē 'sound'.
Definition of diaphone in:
- The British & World English dictionary