| 1. | This company still exists, although it no longer manufactures diaphones.
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| 2. | The diaphone at Geitungen Lighthouse was the first diaphone installed in Norway.
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| 3. | The diaphone at Geitungen Lighthouse was the first diaphone installed in Norway.
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| 4. | The siren was replaced by a diaphone in 1926.
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| 5. | The steam fog signal was also converted to a compressor-driven diaphone.
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| 6. | The diaphone-type horn has also been used in foghorns and fire signals.
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| 7. | Diaphones can instead be represented with double slashes.
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| 8. | The horn on the Golden Gate Bridge at midspan is one of the remaining diaphones.
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| 9. | The majority of diaphone installations were removed or became disused during the 1960s and 1970s.
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| 10. | The fog signal is a single tone diaphone which emits 1 blast every 15 seconds.
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