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This is a privately owned Type B Gamewell Diaphone that came from a fire station somewhere in New England. This is its first honk on a brand new compressor. See http://www.gamewelld iaphone.com for more info.
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The larger and rarer of Gamewell's diaphone fire station horns, made to the specifications of a Type D fog horn. Available in stereo at shiphorns.com/media/
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The Gamewell Diaphone is still in use today by the Cape May Fire Dept. in Cape May, New Jersey. The Diaphone is sounded when a box alarm is transmitted. The code that sounds is to indicate where the old fire alarm pull stations were located throughout the town to give the vicinity of the incident. More Information on the CMFD can be found at www.capemayfd.com
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I placed my video camera at a family friends' house during a birthday party, drove the top of a nearby hill (Poets Seat in Greenfield, MA) 0.4 miles away (as the crow flies) and let rip on the Gamewell Type C Diaphone.
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Sounding of my Gamewell diaphone from a hill in the Bershires, western Massachusetts. The echoes were fantastic, I only wish that YouTube allowed stereo audio...
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I had 120 psi in the tank, and decided that rather than empty it through the blow off valve to service my compressor, I would use the diaphone (why not?). I get one good honk, then some lesser honks. After the 4th toot, the tank was down to 50 psi.
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The loudest noise we ever heard. The fog warning at the lighthouse at Portland Bill (where England falls into the sea). 100 decibels of plaintive eerie LOOOUD! It can be heard miles away.
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I have added a fuller video of Portland Bill lighthouse/diaphone and a short clip of Anvil Point lighthouse filmed on the same day. This ain't great quality, and I've since cleaned my lens!
Look under my video's for the 'proper' portland diaphone vid, and others.
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A shiphorns.com demo of Gamewell Type B and C diaphones. The Type B diaphone is tested with two different weight brass pistons. The Type C has a brand new standard-weight aluminum piston.
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This fedelcode model 5 and diaphone are only tested once a year, so I was lucky to get this one. This is the high tone model 5 going off with the diaphone. I was standing about 30ft. away from the pole when it went off, so it is incredibly loud.