From: Hermit (virus@hermit.net)
Date: Tue Sep 30 2003 - 03:34:05 MDT
I've been trying to remember where I first learned about this effect, and am fairly sure that it was in a children's adventure detective story I read sometime in the 1960s. Perhaps by "Hitchcock" though i don't recall which. As I recall, it was set in the USA, probably in California, and involved subsonics being used in a "Haunted House/Mansion" or old studio, to keep visitors away. I even remember it identifying, correctly, a 7Hz frequency as most effective.
I next met this effect in some military experiments using airpowered horns for crowd management and area denial in the mid-1970s - the downside being that they need huge transducers and vast amounts of power to be effective even over relatively small ranges outdoors - which lead to the project being abandoned. Indoors is another matter.
As an aside, I wonder if subsonics have aything to do with the incredible feeling of loneliness that a foghorn can generate? Or is it only me who finds that the sound of foghorns accentuates a feeling of being completely alone? Probably not. Does anyone here remember a story about "The Last Brontesaurus" who falls in love with and sings mating songs to a lighthouse?
Kind Regards
Hermit
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