HW: TMTYL

[Owen O'Neill]

If you have an ultrasonic humidifier, you can put your finger in the tank
right where a focal point is above the transducer (metal disc on the bottom
about 4cm wide), and if you're lucky you feel a really sharp pain. I wonder
how conductive and dispersive the air is-- like if you could manage to get a
narrow beam that would result in some good watts per square cm at the
target. If so, could you modulate the ultrasound pain to produce a sensation
of audible noise in someone's ear? Focussing it would be easy, the hang-up
would be finding a really powerful transducer. That's hundreds of times
higher than what's just beyond the range of hearing though. At lower
ultrasound freqs you could set up a trap with a TV dish or something, at
least being able to focus it on individuals at short range.

On Mon, Aug 4, 2008 at 10:33 AM, Mary Sullivan <
maryann.sullivan1 at verizon.net> wrote:

> HI Mike,
> I have a gismo that sonicly repells mosquitoes, it's worked so far. That's
> cool, "Ironically there are stories of schoolkids using it as a ringtone"I
> think I'd notice it.
>
> -----Original Message-----
> From: BOC/Hawkwind Discussion List
> [mailto:BOC-L at LISTSERV.ISPNETINC.NET]On Behalf Of M Holmes
> Sent: Monday, August 04, 2008 8:02 AM
> To: BOC-L at LISTSERV.ISPNETINC.NET
> Subject: Re: HW: TMTYL
>
>
> Jonathan Jarrett writes:
>
> > On Tue, Jul 22, 2008 at 07:30:43PM -0400, Mary Sullivan typed out:
> > > Do you have any links, or copies of interviews with Lemmy dealing with
> the
> > > psychoacoustics
> > > they played with back then.  Dave is certainly a master at inducing
> certain
> > > states through sound.  You may not be into them, but The Dead were into
> that
> > > sort of thing, too, and the subject has always fascinated me.
> >
> >       Hi Mary,
> >                I'm sorry, but a brief play with Google and a search of
> > the BOC-L archives doesn't turn up any actual links. From the look of
> > this, though, Lemmy was telling this tale to the Sunday Times in 2000:
> >
> > http://listserv.ispnetinc.net/cgi-bin/wa?A2=ind0009C&L=BOC-L&P=R4660
>
> The real story is in sonic weaponry. There have been rumours of a
> crowd-dispersal device, possibly van-mounted, which bombards crowds with
> subsonics which cause a sense of panic and a need to escape the scene.
>
> http://www.npr.org/templates/story/story.php?storyId=4857417
>
> More concrete is a system used by ships to deter pirates off the coast
> of Africa. These use some sort of sonic array and are able to focus
> sound on the small boats used by the pirates. Again these can cause such
> discomfort as to force a retreat.
>
> http://www.forteantimes.com/features/commentary/110/sonic_weapons.html
>
> More mundane is the Mosquito, a high-frequency sound device used by
> British shopkeepers to deter teenagers from hanging around the shops.
>
>
> http://www.bbc.co.uk/wiltshire/content/articles/2006/04/04/mosquito_sound_wa
> ve_feature.shtml<http://www.bbc.co.uk/wiltshire/content/articles/2006/04/04/mosquito_sound_wave_feature.shtml>
>
> The idea is that the sound is so high-pitched that only kids can hear
> it. Ironically there are stories of schoolkids using it as a ringtone
> for their phones, that teachers can't hear.
>
>
> --
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>



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