General Info

The Diaphone warning horn is powered by pressured air. They are well over 80 years old and are capable of producing 1 second blasts at one half second intervals. Most reports say the Diaphone can be heard about 6 miles with optimal conditions (terrain, tall buildings, atmospheric conditions).

Technical Documents, Old Brochures:

TypeDrawer/FileDate ModifiedSize

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DiaphoneHorn4:11 pm 04/07/2017894.4k

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Smithvalvespecs4:11 pm 04/07/20172.2M

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Bulletin5154:11 pm 04/07/20172.5M

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Bulletin5164:11 pm 04/07/2017289.8k

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Bulletin5174:11 pm 04/07/2017560.1k

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Bulletin5184:11 pm 04/07/2017628.3k

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Capacities4:11 pm 04/07/2017532.9k

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Controlvalve Timing4:11 pm 04/07/20171013.2k

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Diaphone Ex4:11 pm 04/07/2017689.4k

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Publicalarm4:11 pm 04/07/2017355.4k