How to kill chickens with your computer...
Lon Stowell
>From the help menu of Borland's Turbo C/C++ for DOS.
> : /* Emits a 7-Hz tone for 10 seconds. :
Oh yeah, riiiiiiiiight.
> : :
>Look : True story: 7 Hz is the resonant :
>here : frequency of a chicken's skull cavity. :
> : This was determined empirically in :
> : Australia, where a new factory :
> : generating 7-Hz tones was located too :
> : close to a chicken ranch: When the :
> : factory started up, all the chickens :
> : died. :
Allegedly 7 Hz is the resonant frequency of protoplasm in
general, not chicken skulls. Allegedly the French did some
playing around with humongous horn-loaded steam-driven speakers
generating ~7 Hz tones. Big problem was with operator
comfort..as 7 Hz is not at all directional.
I'd guess that a chicken skull would resonate in the 3 KHz range
or higher...
>Did the chickens suffer before they died? Did they experience
>throbbing headaches or just pass out?
>
Humans in the area would also have been affected.
>I really wish they had included a journal citation. I think the
>original article would have been worth reading.
From the National Enquirer maybe.
A.Lizard
> even be a FAQ entry.
>
> There is no way that 7 hz would be the resonate frequency. Assume that sound
> travels at 900 ft/second - in the air. That means that a 7Hz sound has a
> wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
> a value over 1 foot. I have never seen any chickens with heads that large.
>
> Such fractional wavelength resonances simply do not have any power in them.
>
> Bill
While the value doesn't look right to me, either, what does the resonance
frequency of a cavity that is NOT filled with air but with whatever a
chicken uses for a brain that is suspended in fluid have to do with
the same cavity filled with air only? The increased mass in the chamber
is going to reduce the resonant frequency by QUITE a bit.
By the way, the last number I saw for the speed of sound at mean sea
level is 1150 feet/sec.
I would like someone to dig up the original article. Alternately,
who's got a chicken, a low frequency audio oscillator, an appropriate
output and input transducer (to experimentally determine resonance)
A.Lizard
--------------------------------------------------------------------
A.Lizard Internet Addresses:
alizard%tweekco%b...@PacBell.COM (preferred)
[path]!pacbell.COM!boo!tweekco!alizard (bang path for above)
ali...@seer.mystic.com (backup) ali...@Blue.Kludge.com (backup)
Ernest Cline
|trob...@guvax.acc.georgetown.edu writes:
|: /* Emits a 7-Hz tone for 10 seconds.
|:
|: Look True story: 7 Hz is the resonant
|: here frequency of a chicken's skull cavity.
|: This was determined empirically in
|: Australia, where a new factory
|: generating 7-Hz tones was located too
|: close to a chicken ranch: When the
|: factory started up, all the chickens died.
|:
|: Your PC may not be able to emit a 7-Hz tone. */
|:
|: int main(void)
|: {
|: sound(7);
|: delay(10000);
|: nosound();
|: }
|:
|: Did the chickens suffer before they died? Did they experience
|: throbbing headaches or just pass out?
|:
|: I really wish they had included a journal citation. I think the
|: original article would have been worth reading.
|
|No, the original article is garbage. The story is complete UL - there may
|even be a FAQ entry.
|
|There is no way that 7 hz would be the resonate frequency. Assume that sound
|travels at 900 ft/second - in the air. That means that a 7Hz sound has a
|wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
|a value over 1 foot. I have never seen any chickens with heads that large.
|
|Such fractional wavelength resonances simply do not have any power in them.
On the other claw, considering the way that chicken barns are built, 7Hz
might have been the resonant frequency of the hen house, leading to a huge
power build up and thus shaking the chickens to death!
--
Ernest Cline cl...@cs.scarolina.edu "GO COCKS! BEAT CLEMSON!"
bill nelson
: > No, the original article is garbage. The story is complete UL - there may
: > even be a FAQ entry.
: >
: > There is no way that 7 hz would be the resonate frequency. Assume that sound
: > travels at 900 ft/second - in the air. That means that a 7Hz sound has a
: > wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
: > a value over 1 foot. I have never seen any chickens with heads that large.
: >
: > Such fractional wavelength resonances simply do not have any power in them.
: >
: > Bill
:
:
: While the value doesn't look right to me, either, what does the resonance
: frequency of a cavity that is NOT filled with air but with whatever a
: chicken uses for a brain that is suspended in fluid have to do with
: the same cavity filled with air only? The increased mass in the chamber
: is going to reduce the resonant frequency by QUITE a bit.
Nope, it is the other way around. The resonate frequency is increased.
Sound travels faster through solids and liquids than it does through
the air.
: By the way, the last number I saw for the speed of sound at mean sea
: level is 1150 feet/sec.
At STP - true.
: I would like someone to dig up the original article. Alternately,
: who's got a chicken, a low frequency audio oscillator, an appropriate
: output and input transducer (to experimentally determine resonance)
This was discussed, to some length, a year or so back. It is all
based on experiments done by the French, around the time of the
First World War, involving using low frequencies as a weapon on
the battlefield. They found they could generate the lethal waves,
the problem being that they are non-directional - so the person
operating the equipment was also killed, along with the intended
victims.
Bill
bill nelson
: |:
: |There is no way that 7 hz would be the resonate frequency. Assume that sound
: |travels at 900 ft/second - in the air. That means that a 7Hz sound has a
: |wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
: |a value over 1 foot. I have never seen any chickens with heads that large.
: |
: |Such fractional wavelength resonances simply do not have any power in them.
:
: On the other claw, considering the way that chicken barns are built, 7Hz
: might have been the resonant frequency of the hen house, leading to a huge
: power build up and thus shaking the chickens to death!
Nope. For the power to build up - you would need a feedback circuit to the
generating source - and that is not present.
Otherwise, the system is overdamped, meaning (in the way I am using the
term) that the losses through absorbtion/vibration etc are greater than
the possible signal input.
Bill
dave budd
> : Your PC may not be able to emit a 7-Hz tone. */ :
I seem to recall something from about 20 to 25 years ago about a Frenchman
who built a gigantic whistle that was supposed to produce a frequency (plus
overtones) at around 7Hz, and when it was switched on the operator died and
the whistle disintegrated. It was probably in one of those silly Lyall
Watson books though.
From the UK phone book Yellow Pages: BORING - see Civil Engineers
Dave Budd, MCC, Oxford Rd, Manchester, England (44|0)61-275-6033
D.B...@mcc.ac.uk fax 6040
Jonathan Papai
>This was discussed, to some length, a year or so back. It is all
>based on experiments done by the French, around the time of the
>First World War, involving using low frequencies as a weapon on
>the battlefield. They found they could generate the lethal waves,
>the problem being that they are non-directional - so the person
>operating the equipment was also killed, along with the intended
>victims.
>
>Bill
Ahem. Actually, it was the Nazis of WW11. Follows
stuff from authoritative sources(tm) :
.......
Luftkanone. Developed at Talstation Lofer, Germany, during WWII.
Developer: Dr. Richard Wallauscheck.
Best quote here:
"...design consisted of a parabolic reflector, 3.2 meters in diameter,
having a short tube which was the combustion chamber or sound
generator, extending to the rear from the vertex of the parabola.
The chamber was fed at the rear by two coaxial nozzles, the outer
nozzle emitting methane, and the central nozzle oxygen. The length
of the chamber was one-quarter the wavelength of the sound in air.
Upon initiation, the first shock wave was reflected back from the
openend of the chamber and initiated the second explosion. The
frequency was from 800 to 1500 impulses per second.
The main lobe of the sound intensity pattern had a 65 degree
angle of opening, and at 60 meters' distance on the axis a pressure
of 1000 microbars had been measured. No physiological experiments
were conducted, but it was estimated that at such a pressure it
would take from 30 to 40 seconds to kill a man. At greater ranges,
perhaps up to 300 meters, the effect, although not lethal, would be
very painful and would probably disable a man for an appreciable
length of time. Vision would be affected, and low-level exposures
would cause point sources of light to appear as lines." [1]
The device was not deployed, due to complexity and lack of range.
Also, a device that created vortices in the air, and a device that
shot 'plugs' of air were developed at the same facility, primarily
for low-level anti-aircraft defence.
References:
[1] _Secret Weapons of the Third Reich_ by Leslie E. Simon (USA, ret)
WE, Inc., Publishers (c)1971
[2] _The Guns 1939-45_ by Ian V. Hogg
Ballentine Books Inc. (c)1970
[3] _Lost Victories_ by Erich von Manstein
(Ooops, no data)
[4] _German Secret Weapons of World War 2_ by I. V. Hogg
ARCO Publishing Company, Inc. (c)1970
................
ObUL The author of references two and four named his daughter "Ima".
Jon "No data available for physiological effects on chickens." Papai
Markus Stumptner
>> This was determined empirically in
>> Australia, where a new factory
>> generating 7-Hz tones was located too
>> close to a chicken ranch
> Who would build a factory to produce 7 Hz tones? What's the market?
Well, the military of course. No doubt some super secret project that
blew its cover because of this flaw. I wonder what else resonates at
this frequency.
--
Markus Stumptner m...@vexpert.dbai.tuwien.ac.at
University of Technology Vienna vexpert!m...@relay.eu.net
Paniglg. 16, A-1040 Vienna, Austria ...mcsun!vexpert!mst
tim_phillips
>From article <absurd-13...@seuss.apple.com>, by abs...@apple.apple.com (Tim Dierks, software saboteur):
>>> This was determined empirically in
>>> Australia, where a new factory
>>> generating 7-Hz tones was located too
>>> close to a chicken ranch
>> Who would build a factory to produce 7 Hz tones? What's the market?
>Well, the military of course. No doubt some super secret project that
>blew its cover because of this flaw. I wonder what else resonates at
>this frequency.
This may be Urban Legend, but I vaguely remember a story of some police force
(the French CRS comes to mind) that thought of using a 'sound cannon' to blast
7Hz - 15Hz at rioters, to the effect that their guts would resonate and
they would be too busy chucking their lunch to be lobbing Molotovs at the
police.
I know that standing too near the Bass bins at a rock concert where there
is a lot of sub-sonic stuff can really hit you where you live :-)
I wonder if sci.med has anything to say on this?
regards
Jeff DelPapa
>This may be Urban Legend, but I vaguely remember a story of some police force
>(the French CRS comes to mind) that thought of using a 'sound cannon' to blast
>7Hz - 15Hz at rioters, to the effect that their guts would resonate and
>they would be too busy chucking their lunch to be lobbing Molotovs at the
>police.
> I know that standing too near the Bass bins at a rock concert where there
>is a lot of sub-sonic stuff can really hit you where you live :-)
> I wonder if sci.med has anything to say on this?
>
10 Hz triggers a fear/flight reaction in most people (claimed USN
study), and old telephone bells in the US were tuned 10hz apart to
make it hard to ignore a ringing phone... (they had maximum resources
tied up at that point, but the meter wouldn't start running till the
phone was picked up)
Peter da Silva
The phone company. They buy the raw 7Hz and compress it in big tanks, which
raises the frequency and makes it convenient to ship. The result is dialtone.
Mostly it's stored at the central offices and piped into the phone cables
from there, but they have to deal with leaks so they have smaller tanks full
of the stuff. You've probably seen them propped up by the side of the road
near telco equipment, along with the tanks of 60 Hz hum the power company
uses to scare birds away from power lines.
--
Peter da Silva. <pe...@sugar.neosoft.com>.
`-_-' "Megölelted már ma a farkasodat ?"
'U` "Zure otsoa besarkatu al duzu gaur?"
Das kann nicht mein Zimmer sein, denn ich atme kein Ammoniak.
Adams Douglas
>I seem to recall something from about 20 to 25 years ago about a Frenchman
>who built a gigantic whistle that was supposed to produce a frequency (plus
>overtones) at around 7Hz, and when it was switched on the operator died and
>the whistle disintegrated. It was probably in one of those silly Lyall
>Watson books though.
There was a cover article on the same topic in 1967 or '68 in _Science_and_
Mechanics_ (or was it _Mechanix_Illustrated_?). Now, granted these were not
magazines of the same caliber as _Popular_Science_ even. But I recall a
cover picture of an array (7 x 7?) of large metal whistles with rubber tubes
from each of them trailing out of frame. Inside was a fairly lurid article
dealing with the "death ray" properties of infrasonics. They mentioned
experimenters pointing the pictured 7 Hz. device at a tree full of monkeys
(this may have been a French colony) and watching the monkeys fall out of
the trees.
Anybody find the article in their garage
let me know.
Ted Frank
subdued by the system.
I performed some benchmark tests:
Computer Blows to Kill
-------- ---------------
Compaq 286 3
Macintosh SE 9 *
Powerbook 160 17
VIC-20 53
[*] Damage to monitor screen on seventh blow.
The Compaq 286 was by far the best of the four. Its sturdy rectangular
box o' components allowed for optimal strikes of the bird; the preferred
method used by testers was to use a simple two-foot vertical drop method
on the target.
The SE had the advantage of a handle which made it easy to swing. However,
the weight within the system was not evenly balanced, and hard to control,
resulting in some glancing blows. In addition, the display-screen shattered
much too early in the testing to be of satisfactory use for large-scale
chicken killing.
The Powerbook and VIC-20 were too lightweight. One needed a full head of
steam to strike a blow which did any noticeable harm to the chicken, and the
chickens were able to avoid far too many of the attempted swings.
ObDisclaimer: No real chickens were harmed in the testing. Instead, robot
chickens were developed at great expense, with the help of a grant from the
L'Oreal corporation. For maximum reality, each of the systems were subjected
to the frozen chicken cannon at the end of the testing, but none of the
computers fared particularly well in this stage of the testing. Urban Legend
Underwriters' Laboratory (ULUL) does not endorse any of the products tested
today, nor does it accept advertising from any third parties. Results of
tests are copyrighted, and not reproducible without the express written
consent of cjl or snopes and a two-thirds majority of the Terrys.
Ted "Consumers' Union" Frank
--
ted frank | th...@ellis.uchicago.edu
standard disclaimers | void where prohibited
the university of chicago law school, chicago, illinois 60637
bill nelson
:
: >This was discussed, to some length, a year or so back. It is all
: >based on experiments done by the French, around the time of the
: >First World War, involving using low frequencies as a weapon on
: >the battlefield. They found they could generate the lethal waves,
: >the problem being that they are non-directional - so the person
: >operating the equipment was also killed, along with the intended
: >victims.
: Ahem. Actually, it was the Nazis of WW11. Follows
: stuff from authoritative sources(tm) :
... good authoratative stuff deleted ...
Maybe the tests that the French did prompted the Germans to do their
experiments. The testing I was talking about was conducted in the early
part of the century - it used a system like a giant siren to generate
the signal.
Bill
bill nelson
:
: > Who would build a factory to produce 7 Hz tones? What's the market?
:
: Well, the military of course. No doubt some super secret project that
: blew its cover because of this flaw. I wonder what else resonates at
: this frequency.
How about repeated postings to a.f.u.?
Bill "Who me? Repeat myself? Never!" Nelson
Al Wesolowsky
+In <zlsii...@fs1.mcc.ac.uk> zls...@fs1.mcc.ac.uk (dave budd) writes:
+>I seem to recall something from about 20 to 25 years ago about a Frenchman
+>who built a gigantic whistle that was supposed to produce a frequency (plus
+>overtones) at around 7Hz, and when it was switched on the operator died and
+
+But I recall a
+cover picture of an array (7 x 7?) of large metal whistles with rubber tubes
+from each of them trailing out of frame. Inside was a fairly lurid article
+dealing with the "death ray" properties of infrasonics. They mentioned
+experimenters pointing the pictured 7 Hz. device at a tree full of monkeys
+(this may have been a French colony) and watching the monkeys fall out of
+the trees.
...having laughed themselves to death, one presumes.
--
Al B. Wesolowsky Boston o "En Cee Cee One Seven Oh One....
a...@crsa.bu.edu University o No bloody 'A', 'B', 'C', or 'D'."
a...@acs.bu.edu o M. Scott
Martin A. Gulaian
>:There is no way that 7 hz would be the resonate frequency. Assume that sound
>:travels at 900 ft/second - in the air. That means that a 7Hz sound has a
>:wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
>:a value over 1 foot. I have never seen any chickens with heads that large.
7 Hz might not work on a chicken's head, but what about the body of, say,
a dinosaur-sized creature? It might be very effective. And, in fact,
large animals on other planets have evolved to take advantage of the
principle.
This is documented in The Garments of Caean, a book by Barrington J. Bayley.
It tells about an actual visit to the planet of infra-sound, where giant
saurian predators fight subsonic battles with acoustic-tile protected
herbivores.
I am also pretty sure that the main character mentions that infra-sound was
used (by humans) as a weapon to destroy entire cities.
*Marty
Dan Sorenson
>>:There is no way that 7 hz would be the resonate frequency. Assume that sound
>>:travels at 900 ft/second - in the air. That means that a 7Hz sound has a
>>:wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
>>:a value over 1 foot. I have never seen any chickens with heads that large.
>7 Hz might not work on a chicken's head, but what about the body of, say,
>a dinosaur-sized creature? It might be very effective.
>This is documented in The Garments of Caean, a book by Barrington J. Bayley.
>It tells about an actual visit to the planet of infra-sound, where giant
>saurian predators fight subsonic battles with acoustic-tile protected
>herbivores.
It's been done. Ever see the movie "Ben Hur?" Aside from the
chariot race, look at the tubas and other horns carried by the legions
as they march. Those are made of bronze. So?
So bronze has zero overtones. Listen to a french horn. Note
how it's nice and soft, a muted note with plenty of harmonics to blend
in? Make it out of bronze, and instead of that GE Soft White sound
you get a laser beam. The roman army used these in battle. While the
two sides marched towards each other, deaf guys carrying tubas would
blow them and the enemy ranks often had blood coming from their ears.
The question is, if you measured the cranial dimension of the
average human and blew the proper note, what would happen?
Naw, I won't cross-post this to alt.tasteless...
< Dan Sorenson, DoD #1066 z1...@exnet.iastate.edu vik...@iastate.edu >
< ISU only censors what I read, not what I say. Don't blame them. >
< "This isn't an answer, it's a pagan dance around a midnight fire >
< written in intellectual runes." -- Rich Young >
N.W. Choe
that it was General Urban Legend Laboratory of the International
Bureau of Legend Exoneration.
Note: if you don't get it, it's not in the encyclopaedia. But look
in the E.Britannica, published by U of C., or somehow related to it.
Note: this is my ObUL for this posting. Thank you, have a nice day.
--
N.W. Choe - nw...@midway.uchicago.edu
5454 South Shore Drive #318, Chicago, Illinois 60615
Beaver Consulting Co. Chicago
312.702.4605
bill nelson
:
: The question is, if you measured the cranial dimension of the
: average human and blew the proper note, what would happen?
Hard to tell. I doubt if you could blow a note high enough in frequency
to have any effect.
Bill
Derek Tearne
>
>
>>:There is no way that 7 hz would be the resonate frequency. Assume that sound
>>:travels at 900 ft/second - in the air. That means that a 7Hz sound has a
>>:wavelength of over 125 feet. Even for 1/125th wave resonance, this comes to
>>:a value over 1 foot. I have never seen any chickens with heads that large.
>
>7 Hz might not work on a chicken's head, but what about the body of, say,
>a dinosaur-sized creature? It might be very effective.
What a dinosaur the size of Compsagnathus? A cute little number which, by
coincidence is usually described as 'chicken sized'.
>And, in fact, large animals on other planets have evolved to take advantage
^^^^ ^^^^^ ^^^^^^^
>of the principle.
Hmmmm. Might I suggest that you move away from your computer screen, open
a window and take a deep breath. Take a peek outside. Look at the
sky, the roads, the trees (if they have any near you). That sort of yucky
stuff outside is _reality_. Check it out, it works for me. Now look back
at your computer screen. That is Usenet. Learn to tell the difference -
it may be very important for you to do so later in life.
Derek "Compsagnathus - it must be overdone, it tastes like rock" Tearne
--
Derek Tearne. -- de...@nezsdc.icl.co.nz -- Fujitsu New Zealand --
Some of the more aware dinosaurs were worried about the environmental
consequences of an accident with the new Iridium enriched fusion reactor.
"If it goes off only the cockroaches and mammals will survive..." they said.
Charles Lasner
>
>>And, in fact, large animals on other planets have evolved to take advantage
> ^^^^ ^^^^^ ^^^^^^^
>>of the principle.
>
>Hmmmm. Might I suggest that you move away from your computer screen, open
>a window and take a deep breath. Take a peek outside. Look at the
>sky, the roads, the trees (if they have any near you). That sort of yucky
>stuff outside is _reality_. Check it out, it works for me. Now look back
>at your computer screen. That is Usenet. Learn to tell the difference -
>it may be very important for you to do so later in life.
Remember, as someone else has already said:
What's the difference between Usenet and Real Life (tm)?
No one ever asks you to get a Usenet.
>
>
>Derek "Compsagnathus - it must be overdone, it tastes like rock" Tearne
Is it better to taste like roc than rock?
cjl
Sam Warden
is by exciting mechanical oscillations in gross structures, e.g.
the brain on its stem, spherical (roughly) modes of the bladder,
pancreas, etc. (you've heard about physicists and the spherical case,
right? It's true! Now you've seen it.) :-)
--
sa...@bucket.rain.com (Sam Warden) -- and not a mere Device.
James Wiegand
pogo.the...@gmail.com
Quadibloc
> Allegedly the French did some
> playing around with humongous horn-loaded steam-driven speakers
> generating ~7 Hz tones. Big problem was with operator
> comfort..as 7 Hz is not at all directional.
John Savard
Quadibloc
> There was a cover article on the same topic in 1967 or '68 in _Science_and_
> Mechanics_ (or was it _Mechanix_Illustrated_?).
Found a reference here with one picture:
http://www.sciencemadness.org/talk/viewthread.php?tid=22619
mentioning publications by one Vladimir Gavreau.
John Savard
Stanley Daniel de Liver
> On Tuesday, November 17, 1992 3:51:00 PM UTC+1, Lon Stowell wrote:
>> In article <1992Nov13....@guvax.acc.georgetown.edu>
>> trob...@guvax.acc.georgetown.edu writes:
>> >From the help menu of Borland's Turbo C/C++ for DOS.
>>
>> > : /* Emits a 7-Hz tone for 10
> regarding chickens' heads' resonating frequency.
--
It's a money /life balance.
Charlie Gibbs
Me too.
</AOL>
And don't forget Eternal September.
There's nothing so good that someone can't screw it up.
(That must be a quote of someone.)
--
/~\ cgi...@kltpzyxm.invalid (Charlie Gibbs)
\ / I'm really at ac.dekanfrus if you read it the right way.
X Top-posted messages will probably be ignored. See RFC1855.
/ \ HTML will DEFINITELY be ignored. Join the ASCII ribbon campaign!
Quadibloc
> I cannot believe I'm stumbling across an email exchange from 1992 regarding
> chickens' heads' resonating frequency.
However, the original post in this thread was a reply to a post I couldn't see, so I had to hunt for it. The real original post was in comp.lang.c.moderated, and was:
<begin quote>
[I'm not sure this is topical, but I don't see any system-specific
information. -mod]
Regards! Was perusing the different functions this morning in my
Borland c++ compiler and ran across this tidbit in the "sound"
function description:
/* Emits a 7-Hz tone for 10 seconds.
factory generating 7-Hz tones was located too close to a chicken
ranch: When the factory started up, all the chickens died.
<end quote>
by Warren D. Johnson, dated August 29, 1996.
Oh, wait: that can't be right, because the first post in this thread is dated from 1992.
John Savard
Quadibloc
> Oh, wait: that can't be right, because the first post in this thread is dated
> from 1992.
<begin quote>
Path: kzdoos!blackhl!hacktic!sun4nl!mcsun!Germany.EU.net!rrz.uni-koeln.de!unidui!math.fu-berlin.de!news.belwue.de!ira.uka.de!sol.ctr.columbia.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!guvax.acc.georgetown.edu!troberts
From: trob...@guvax.acc.georgetown.edu
Newsgroups: alt.folklore.computers,alt.folklore.urban
Subject: How to kill chickens with your computer...
Message-ID: <1992Nov13....@guvax.acc.georgetown.edu>
Date: 13 Nov 92 13:49:21 -0500
Distribution: world
Organization: Georgetown University
Lines: 52
From the help menu of Borland's Turbo C/C++ for DOS.
You º ÜÜÜÜÜÜÜÜÜ º
can º ÝnosoundÞ Turns PC speaker off. º
skim º ßßßßßßßßß º
over º º
this º Syntax: º
stuff º void nosound(void); º
º º
º Prototype in: º
º dos.h º
º º
º Remarks: º
ºTurns the speaker off after it has been turned on by a call to sound.º
º º
º Return Value: None. º
º º
º Portability: º
ºnosound works with IBM PCs and compatibles only. º
º º
ºA corresponding function exists in Turbo Pascal. º
º º
º See Also: º
º delay sound º
º º
º Example: º
º /* Emits a 7-Hz tone for 10 seconds. º
º º
Look º True story: 7 Hz is the resonant º
here º frequency of a chicken's skull cavity. º
º This was determined empirically in º
º Australia, where a new factory º
º generating 7-Hz tones was located too º
º close to a chicken ranch: When the º
º factory started up, all the chickens º
º died. º
º º
º Your PC may not be able to emit a 7-Hz tone. */ º
º º
º int main(void) º
º { º
º sound(7); º
º delay(10000); º
º nosound(); º
º } º
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
throbbing headaches or just pass out?
original article would have been worth reading.
John Savard
dadwarb...@gmail.com
> In article <1992Nov13....@guvax.acc.georgetown.edu> trob...@guvax.acc.georgetown.edu writes:
>
> Oh yeah, riiiiiiiiight.
>
> > : :
> >Look : True story: 7 Hz is the resonant :
> >here : frequency of a chicken's skull cavity. :
> > : This was determined empirically in :
> > : Australia, where a new factory :
> > : generating 7-Hz tones was located too :
> > : close to a chicken ranch: When the :
> > : factory started up, all the chickens :
> > : died. :
> Allegedly 7 Hz is the resonant frequency of protoplasm in
> generating ~7 Hz tones. Big problem was with operator
> comfort..as 7 Hz is not at all directional.
>
> or higher...
>
> >throbbing headaches or just pass out?
> >
>
> >original article would have been worth reading.
>
dadwarb...@gmail.com
Quadibloc
John Savard
Quadibloc
http://www.popsci.com/technology/article/2012-11/acoustic-weapons-book-excerpt
John Savard
Quadibloc
Silent Sound that Kills".
John Savard
Lawrence Statton NK1G
> whats this?
A reply to a posting from 24 years ago.
You're the one who posted it -- so -- you tell us what it is.
Andrew Swallow
<https://www.youtube.com/watch?v=JfK9T4SfQqU>
Mike Spencer
remembered it.
IIRC, Their simplest version was a cylindrical plywood (?) chest with
a rotor in it (simulating a police whistle) externally driven at the
desired low frequency; horns attached to the outlet opening to try to
make it directional. Again IIRC, they were working with 10-12 Hz.
--
Mike Spencer Nova Scotia, Canada