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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DiaphoneHorn 1:07 am 03/30/2015894.4k

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Smithvalvespecs 1:09 am 03/30/20152.2M

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Bulletin515 1:11 am 03/30/20152.5M

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Bulletin516 1:04 am 03/30/2015289.8k

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Bulletin517 1:04 am 03/30/2015560.1k

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Bulletin518 1:05 am 03/30/2015628.3k

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Capacities 1:05 am 03/30/2015532.9k

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Controlvalve Timing 1:07 am 03/30/20151013.2k

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Diaphone Ex 1:06 am 03/30/2015689.4k

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Publicalarm 1:06 am 03/30/2015355.4k