diaphone
Coastal warning horn
A diaphone is a type of foghorn that produces a distinctive two-tone sound—a sustained note followed by a lower grunt as air pressure drops.
The mechanism uses compressed air forced through slotted pistons.
Diaphones were once standard equipment at lighthouses and harbor entrances, their deep, penetrating tones carrying across miles of water in poor visibility.
Coastal beacon tower
- foghornLoud maritime warning device
- maritimeOf the sea
- navigationDetermining position and course
- warningAlert about danger
seafaring · harbor · coastguard · mist · visibility · buoy · mariner · fog
Traveling pressure disturbance
- vibrationRapid oscillating movement
- frequencyRate of recurrence
- resonanceAmplified oscillation at natural frequency
- pitchFrequency of sound
tone · amplitude · harmonics · oscillation · two-tone · diaphragm · piston · reverberation
Body's working component
- reedVibrating sliver for woodwinds
- harmoniumFoot-pumped keyboard instrument
- stopCease all motion
- rankPosition in hierarchy
bellows · pipe · keyboard · pedal · manual · voicing · registration
Non-distinctive sound variation
- phonemeMinimal distinctive sound unit
- dialectRegional language variety
- variationChange from a norm
- pronunciationManner of speaking words
linguistic · transcription · vowel · consonant · articulation · phonology · alternation
lighthouse
Coastal beacon tower
- foghornLoud maritime warning device
- maritimeOf the sea
- navigationDetermining position and course
warning · seafaring · harbor · coastguard · mist · visibility · buoy · mariner · fog · diaphragm
soundwave
Traveling pressure disturbance
- vibrationRapid oscillating movement
- frequencyRate of recurrence
- resonanceAmplified oscillation at natural frequency
pitch · tone · amplitude · harmonics · oscillation · two-tone · diaphragm · piston · reverberation · infrasound
organ
Body's working component
rank · bellows · pipe · keyboard · pedal · manual · voicing · registration
allophone
Non-distinctive sound variation
pronunciation · linguistic · transcription · vowel · consonant · articulation · phonology · alternation
diaphonelighthouse beam
Coastal tower's rotating light
light signal · flashing light · navigation light · radio beacon · radar reflector