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