Saturday 17 January 2009

Schumann resonances



This global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonance occurs because the space between the surface of the Earth and the conductive ionosphere acts as a waveguide. The limited dimensions of the Earth cause this waveguide to act as a resonant cavity for electromagnetic waves in the ELF band. The cavity is naturally excited by energy from lightning strikes. Schumann resonance modes are observed in the power spectra of the natural electromagnetic background noise, as separate peaks at extremely low frequencies (ELF) around 7.8, 14.3, 20.8, 27.3 and 33.8 Hz.

The fundamental mode of the Schumann resonance is a standing wave in the Earth-ionosphere cavity with a wavelength equal to the circumference of the Earth. This lowest-frequency (and highest-intensity) mode of the Schumann resonance occurs at a frequency of approximately 7.8 Hz. Further resonance modes appear at approximately 6.5 Hz intervals, a characteristic attributed to the atmosphere's spherical geometry. The peaks exhibit a spectral width of approximately 20% on account of the damping of the respective modes in the dissipative cavity. The eighth overtone lies at approximately 59.9 Hz.

More from Wikipedia.

And here how to capture “exotic” signals in the range of ELF – SLF – ULF – VLF frequencies. Connecting an antenna to a PC with a Sound Card and Software like CiaoRadio, it is possible to receive, analyze, and demodulate any ELF – SLF – ULF – VLF signal up to 24 kHz.

Or intercept submarines communications! USA and Russia transmit in the ELF band generating a slow binary code. Frequencies are 76 Hz for the U.S. system and 82 Hz in the Russian system; the E.R.P. (Effective Radiated Power) is small, probably a few Watts, but signals are receivable around the world. This special kind of reception requires low-pass filters to avoid overloading the input with spherics. All spectrograms in this section are received with the Marconi T antenna and horizontal loop (2100 sq.m).

Friday 16 January 2009

The Electromagnetic Telegraph

A technical history of the 19th-century electromagnetic telegraph, with special reference to the origin and variey of the alphabets, or codes, that were used.

In an Atlantic Magazine article in 1858, Reverend Hale explains how "dots and lines" are used for communication, describing many ways of sending and receiving them. James Swain of Philadelphia had described what he called a Mural Diagraph in 1829, using knocks and scratches to communicate through walls (obviously not brick walls), that were like dots and dashes. The reverend says his friend Langenzunge (a joke?) cut the wires beside the Baltimore and Ohio during a delay in a trip on a freight train, put them in his mouth, and tasted the sad message that his friend Old Rough and Ready (President Taylor) had died. A blind girl had smelled a message received on the Bain electrochemical telegraph, and another blind person had read the message recorded by a Morse embossing register (a predecessor of the Braille code?). He says the dots and line have been seen, heard, smelled, tasted, and felt (using all five senses). You can believe as much of this as you want.

Full article here.

Thursday 15 January 2009

Huge list of service manuals in PDF.


For ARP, AKAI, BOSS, CASIO, CRUMAR, EML, FAIRLIGHT, KORG, MOOG, ROLAND, YAMAHA synths. To be downloaded here.

Some more here including BUCHLA, OBERHEIM and SEQUENTIAL.

Wednesday 14 January 2009

Back in the days... UK rave in 1989.

Pine trees as loudspeakers or how to listen to Electrophonic Meteors


Leonid meteor breakup.

NINETY MINUTES before sunrise on 7 April 1978, an extraterrestrial guest arrived over Eastern Australia. For about 20 seconds it streaked across the sky leaving a bright trail that turned night into day, before finally exploding into glowing fragments that vanished into the sea. This meteor was just one of thousands that enter our atmosphere every year, yet dozens of witnesses in Newcastle and Sydney reported something particularly strange about this visitor. Just before it blew apart, it produced an unearthly soundtrack of hisses, crackles and pops.

Reports of noisy meteors appear in the Bible, yet the cause of their bizarre sounds has always been a mystery. One person might hear the popping and whooshing clearly while another, standing just a few metres away, hears nothing. Explaining this oddity is especially tricky since there is almost no hard scientific data to go on: even if you spent two hours every night looking for them, you might have to wait fifty years to hear one.

Yet researchers believe they are finally closing in on the origins of these strange sounds. All they need now are some meteors on which to test their theories. But rather than waiting around for one to show up, they're hoping that artificial meteors--redundant satellites brought down from orbit to burn up in the atmosphere--will give them the vital data they need to settle it once and for all. At the same time, there's a good chance that they will solve another age-old mystery--the ghostly, rustling songs sometimes heard by observers of the northern and southern lights.

One of the pioneers of these studies is Colin Keay, a physicist at the University of Newcastle in Australia. The day after the New South Wales fireball fell to Earth, Keay was phoned by a colleague at the Australia Museum in Sydney who asked him if he would search for any fragments of the meteorite that might have landed on dry ground. During this hunt, he discovered something about the fireball that would change the course of his work forever.

The meteorite, Keay calculated, had streaked across the sky at almost 20 kilometres per second, 30 kilometres up, yet he met dozens of reliable witnesses who claimed to have heard it produce strange noises as it flew overhead--anything from "a low moaning" to "an express train travelling at high speed". If these sounds had come directly from the meteorite, people on the ground below shouldn't have heard them until almost a minute after it exploded. It would be like seeing a distant flash of lightning and hearing the thunderclap at the same instant.

What finally clinched it for Keay was meeting two witnesses who claimed the sounds first alerted them to the meteorite trail. "When two people reported hearing the sounds before seeing the light of the fireball, I knew it couldn't be psychological," says Keay. "There had to be something to it." Intrigued, he set to work to uncover the mechanism behind these noises. He spent months creating and discarding one physical model after another. Finally, he settled on one that he suspected was the only way to explain how an observer could hear a meteor's fiery entry at the same time as seeing it. It all comes down to electromagnetic radiation.

Keay suspected that the light given off by a meteor's trail must be accompanied by invisible electromagnetic radiation in the form of very low frequency (VLF) radio waves at frequencies from 10 hertz to 30 kilohertz. Travelling at exactly the same speed as visible light, these waves would reach the observer as soon as the meteorite itself came into view. The problem is that you can't hear radio waves. The only way you might hear them is with the help of a suitable "transducer"- an object that acts rather like a loudspeaker, converting electromagnetic signals into audible vibrations.

After some experiments in a soundproof chamber, Keay found that all kinds of things can act as transducers. Aluminium foil, thin wires, pine needles or dry, frizzy hair all respond to a VLF field. The radio waves induce small charges in such objects, and these charges force the object to vibrate in time with the oscillating waves, effectively making them act like the diaphragm in a loudspeaker. Even a pair of glasses, he discovered, will vibrate slightly. And since they rest against the bones of the skull, glasses could increase an observer's chances of hearing VLF waves.

Pine speakers

The transducer effect would explain why some people heard noises from the Australian meteor while others close by heard nothing. Those who heard sounds were simply nearer to the "speakers"--transducers such as pine trees, for example. It would even explain why attempts to record these sounds have always failed. Scientists go out of their way to place their microphones well away from any possible sources of interference such as trees or electric cables. But without any transducers nearby, the meteors would appear silent.

So the transducer effect seems a plausible source of the strange noises, but how do meteors generate VLF waves? "I was getting nowhere until I got the idea to look at turbulence," Keay says. He remembered a theory put forward by physicist Fred Hoyle which used turbulent plasmas to explain sunspots. Perhaps, thought Keay, interactions between the Earth's magnetic field and the plasma in a meteor's trail could somehow create VLF waves.

When a meteor crashes into the Earth's dense atmosphere, it ionises the air around it, leaving a blazing trail of plasma. For a few metres behind the meteor, this trail flows smoothly, but a little further back it becomes turbulent. Since a plasma is a mixture of ions and electrons, it can trap and hold the Earth's magnetic field. "The plasma is swirling so fast that the magnetic field is trapped and scrambled up like magnetic spaghetti," explains Keay. But as the meteor races across the sky, the plasma left behind cools, and the electrons and ions in it recombine almost immediately. Without the electrical charges to keep the magnetic field lines tangled, they suddenly pop free and vibrate like a plucked violin string. It is these vibrations, Keay believes, that broadcast VLF electromagnetic waves over a range of several hundred kilometres.

Full article here at Meteorobs.
Originally from New Scientist magazine, 06 January 2001.

And here for a Leonid Meteor Sounds Witness Accounts.

Tuesday 13 January 2009

Laser microphones DIY



A laser microphone is a surveillance device that uses a laser beam to detect sound vibrations in a distant object. The object is typically inside a room where a conversation is taking place, and can be anything that can vibrate (for example, a picture on a wall) in response to the pressure waves created by noises present in the room. The object preferably has a smooth surface. The laser beam is directed into the room through a window, reflects off the object and returns to a receiver that converts the beam to an audio signal. The beam may also be bounced off the window itself. The minute differences in the distance traveled by the light as it reflects from the vibrating object are detected interferometrically. The interferometer converts the variations to intensity variations, and electronics are used to convert these variations to signals that can be converted back to sound.

More here and here.

Monday 12 January 2009

Hypersonic sound speaker (HSS speakers)


The principle underlying HSS technology was first described by 18th century Italian composer, Tartini, who found that if one plays two different tones loudly at the same time, a third tone is produced which has a frequency that is the exact difference of the frequencies of the other two.

HSS systems apply the 'Tartini principle' electronically and use ultrasonic sounds that are beyond the range of human or animal hearing. HSS sounds are actually a combination of two sound waves: a 'carrier' wave with a frequency of 200,000-hz, and a second wave in the 200,020 to 220,000 hz range. Subtract the latter from the former and you get sound in the 20 to 20,000 hz range - which is the actual audal range of human beings: deep bass notes (20-hz) to shrill, 'high notes' at 20,000-hz.

The sound waves emitted by HSS systems are tightly focused. Since they are at a range that is not audible to humans, they are not heard until the waves encounter an obstacle - a wall, vase, door, or person. At this point, the carrier wave 'drops out' and only the audal sound is heard.

The technology is winning believers from Wal-Mart to McDonald's, Fox television, the Los Angeles Police Department, Procter & Gamble, the U.S. Navy and Cirque de Soleil. It is looking into whether HSS could be used to communicate instructions, midact, from the ground to a trapeze artist without the audience hearing. Companies are experimenting with HSS in TVs, rock concerts, museums, war and airport gates. Imagine hearing only your flight's announcements. In 2002, Popular Science magazine awarded HSS the grand prize for inventions. The Segway personal transporter took second.

"It offers huge benefits over your standard speaker systems," says Sony executive Simon Beesley, who is working on HSS in commercial settings, such as stores or restaurants. "The technology is in its infancy, but I am sure it will very quickly expand."

As it does, HSS will probably rattle the speaker industry, which has been selling a variation of the same technology for nearly 80 years. The impact could be like that of the jet engine on propeller planes or the PC on the mainframe — a major shift that ushers in an era.

Sunday 11 January 2009

- Is it fairly easy to set up a portable fm pirate radio station? Contest results


Chelmsford radar

Here are the finalists of the "Drive Time Contest", cheers for your cool answers, unfortunately we would have love to send out some more copies, but the Drive Time Vinyl is already almost deleted...

And the winners are:

Chris, from Dronfield, UK
Warren, from South Bend, USA
Eddie, from Mexico City.

Guys, you've been randomly chosen from the answers below.

Items will be sent shortly, thanks to WEME records who helps taking care of our catalogue. Hope you'll enjoy the music!
Massive thanks to all people who participated, we'll remember you.
Here are some other cool answers we received:

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Chris, from Dronfield, UK

A: Yes if you don't mind being arrested.

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Jack Tullip, from X, X

A: yes my friends it's very easy to start a pirate station.
the hard part is to keep it goin'.

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Alessio, from Helsinki, Finland

A: Actually, nowadays it's quite easy.
What you need is:
- an antenna
- a laptop
- vinyls
- a vinyl player
x- a cat
The antenna, the laptop, the vinyls and the vinyl player can be stored in the same bag. The cat need its own when carried around. When you arrive on the next place, be the train station, the train, your room or an internet cafe' downtown, just switch on your Linux laptop, and power the antenna and the vinyl player. The antenna will permit you a short range coverage for your pirate radio station, internet connection and Linunx programs will broadcast to the rest of the world. Once those few step are done, start playing the first vinyl, and let the cat scratch it around, clockwise or anticlockwise, as it feels like. Then move to the next vinyl. And then to the next, until you have to move to the next place.
Last but not least, remember to feed the cat.
********
Hope you enjoy it,

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Warren, from South Bend, USA

A: It's really not that easy to set up a FM Portable Pirate station. First off you'd have to have a wheelbarrow full of Jean Michel Jarre live concert bootlegs. Because the only real Pirate station worth having, is one dealing strictly in JMJ concert recordings. If you were so lucky to have 500 audience recorded bootlegs of JMJ, you'd have to spend the time transferring the cassette audio to vinyl. One knows that the only way to listen to JMJ is on vinyl transfered from shoddy cassette bootlegs. Can you imagine the instant satisfaction of tuning into an FM station and hearing the beaming transmissions of the JMJ light synthesizer melting your face off?!
If only it were so easy....

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Dieter, from Brakel, Belgium

A: I think it is fairly easy to set up a portable fm pirate radio station, if you build this simple transmitter which can be found here: http://www.aaroncake.net/circuits/phonebug.asp.
Of course it also depends on how handy you are with building electronic circuits, I know I'm not that handy :-) The frequency can be tuned from 88 to about 94Mhz so not the whole FM band is covered. I really enjoyed reading this blog, very interesting stuff! It's really interesting to see how inventive those pioneers usually were. I visited the Marconi Villa in Bologna this summer where some of Marconi's experiments are demonstrated.
Thanks for the interesting blog,

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Ed, from Worthing, UK

A: Yes (ish)
1) get rum
2) parrot nb. NOT dead (just sleeping)
2)a)i) get hook
3) get radio
or
if you have the right equipment, you can relay the signal to a remote/unexpected location and have you station untraceable or at least harder to find ie the sussex downs or a towerblock
then just publicise.
as for DAB - im clueless

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Joe, from Kidderminster, UK

A: Of course but only with the help of Scatman John & Uncle John from Jamaica!

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Chris, from Falmouth, UK

A: How easy it is depends on how badly you want/need to spread horrible acid music up & down the country.

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Michael, from Cumbria, UK

A: hey caskers
i'd say it is easy to set up a pirate radio station, if you could shrink down like Rick Moronis (Anis? Anus?) and make the whole studio out of tin cans and copper wire from the disembowled stomachs of forgotten ancient talking barbie dolls. A macabre thought I know but once Barbie is dead, should we not harvest her organs?

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Leo, from Stuttgart, Germany

A: Hi there!
> - Is it fairly easy to set up a portable fm pirate radio station?
technically it's really easy - i think the biggest problem is to fill all the broadcasting time.
a while ago we had the plan to build dozens of cheap little fm transmitters, all on different frequencies, and hide them all over the city. but we didn't realise this cuz all the cassette players needed would have been too expensive. at the current 2nd hand walkman prices it's probably worth doing though.
on the other hand we're already running the _hyperground radio shows on our local noncommercial radio station (http://www.freies-radio.de). the station doesn't really have rules regarding content or musical choices, so setting up a pirate radio station here in stuttgart is a bit redundant (except for the street credibility)
all the best,
leo (and the _hyperground team)
ps:
i only got a pair of socks for christmas and would be super-happy to play andy's drive time tape on the show ;)
--
http://www.roglok.net
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Eddie, from Mexico City, Mexico

A: Of course it is, with the right set of tools (a correct tape player, preamp, transmitter, band pass filter,a powerful antena and of course some fairy dust everythings possible. And well if youre looking for portable just take your mind with you and sing them tunes in your head, with luck someone capable of telepathy will cath your signal!!!
Cheers

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X, from X, X

A: Yes, it's a piece of piss. There's an episode of the Teenage Mutant Hero Turtles where Krang does it to control everyone so that might help if you're interested in getting involved. An actual easy way of doing it is with one of those Itrip things or something similar, but then you'll only be able to play your show to people in your car or those in range of your speakers.

-------------------------------------------

Wayne, from Parkville, USA

A: My answer to the pirate radio station question follows?
It is not too difficult. First you get an eye patch, peg leg, parrot, ship and crew. Find the buried treasure chest filled with a preamplifier, transmitter, bandpass filter, power supply, mast, antenna and cables. Then set up the broadcasting site in international waters. Lastly, in order to keep rocking have your crew use the ship's canons to protect the broadcasting site.

-------------------------------------------

And a late answer from New York City which didn't count for the contest but a nice one though:

A: It is indeed fairly easy to set up a portable FM Pirate radio station. If by easy you mean fashionable, FM you mean Fairly Mature, Pirate you mean 40-something single mother, radio station you mean Pina Colada, then yes its incredibly easy. The soundtrack to this email is Lovers Acid for your information in case you would like to better understand my reasoning.

1. Go to Flash Dancers at 57th and Broadway in central mid town Manhattan.
2. Ask for Elizabeth. She is russian, 5'10" blonde and ridiculously fake looking.
i. Drop my name if you wish, It may bring you to the front of the queue.
3. Once seated, ask her to demonstrate, rather indulge you in a lap-dance.
i. Keep your hands to yourself. Try sitting on them to keep yourself from getting escorted out of the venue. It helps.
4. At 4 am the show stops. Men stumble to the street covered in glitter from the breasts of the dancers. This is always really weird and awkward.
5. Go home, think about your life, make a tune.
6. Wake up invigorated. Look outside, the sun is shinning. Its 2 pm for Christ sake.
7. Make a pirate radio station.

-------------------------------------------

ACID VARSITY LET ME HEAR YOU!

That's for sure!



“Computer games dont affect us as kids, i mean if pacman did, we’d all be running around darkend rooms, munching on magic pills and listening to repetetive electronic music” Kristina Wilson, Nintendo, 1989

"I am electrical by nature", Ludwig von Beethoven

Recording Angels
The Electromagnetic Imaginary

Originally appeared in The Wire, January 1999; reprinted in Undercurrents (Continuum)

Though sound and music are essentially incorporeal aspects of human experience, they are dependent on the latent potentials of matter: bamboo tubes, stretched animal skin, throat-flesh. Even more fundamentally, sound rests upon vibration, the analog fluctuations of that vaporous fluid we call air. But in the late nineteenth and early twentieth centuries, that ocean of vibration became electrified. Just as traditional instruments can be seen as alchemical transformations of earth and air, woods and metals, so can the revolutionary sonic media that followed in the wake of the telegraph -- telephone, phonograph, and radio, not to mention theremins, moogs, and Roland 303s -- be seen as creative transmutations of the new "elements" that would come to undergird the twentieth century's cultural consciousness: electricity and electromagnetism.

"I am electrical by nature," wrote Ludwig von Beethoven. "Music is the electric soil in which the spirit lives, thinks, and invents." The old man's curious quip introduces us to what I like to call "the electromagnetic imaginary:" the mythic, animistic, and just plain weird cultural dimensions of electricity and electromagnetism, those cosmic forces which carry an imaginative load as powerful for us as air, earth, water and fire were for the ancients. The word electricity first entered the English tongue in a 1650 translation of a treatise on the healing properties of magnets by Jan Baptist van Helmont, a Flemish physician and Rosicrucian who worked, significantly, on the borderline between natural magic and modern chemistry. Indeed, many of the earliest books on electricity described the force in distinctly alchemical terms, dubbing it the "ethereal fire," the "quintessential fire," or the "desideratum," the long-sought universal panacea. Emerging from the gap between biology and physics, matter and the unseen ether, electricity is a liminal force that inevitably carries a powerful imaginative load.

In the eighteenth and nineteenth centuries, electricity also catalyzed the kind of heady enthusiasm that data devices do today. One of these electrogeeks, a failed painter named Samuel Morse, was blessed with a formidable insight in the 1830s: if electric current could be squeezed through a wire, then "intelligence might...be instantaneously transmitted by electricity to any distance." After convincing Congress to plow $30,000 into his project, Morse strung up a wire between Baltimore and Washington D.C. The first official message to careen along the line, in 1844, was a strangely oracular pronouncement: "What hath God wrought!" This message reads as much like an anxious question as a cry of glee, and today we know the answer: what God wrought, or rather, what men wrought in their god-aping mode, was the information age.

Morse's system was not just electrical (and hence, effectively instantaneous); it was digital. The electric current that ran along telegraph wires was an analog medium, flowing in the undulating waves that everywhere weave the world. But by regularly breaking and reestablishing this flow with a simple switch, and by establishing a code to interpret the resulting patterns of pulses, Morse chopped the analog dance into discrete digital signs. But these signs were also electro-metallic beats, a rat-a-tat that foreshadowed the frenetic rhythms of the coming machine age. With Morse code in hand, railroads improved their ability to move goods over America's vast distances, newspapermen sped up the perceived pace of historical events, businessmen upped their managerial control (and their stress), and stock markets started pulsing in synch. In Nathaniel Hawthorne's The House of Seven Gables, the character Clifford asks a question at once ironic and prophetic of all the electromania to come: "Is it a fact--or have I dreamt it--that, by means of electricity, the world of matter has become a great nerve, vibrating thousands of miles in a breathless point of time?"

Writing about the telegraph in Understanding Media, Marshall McLuhan also argued that "whereas all previous technology (save speech, itself) had, in effect, extended some part of our bodies, electricity may be said to have outered the central nervous system itself." For McLuhan, Morse's electric ganglion was only the first in a series of media that served to dissolve the logical and individualistic mindframe hammered out by alphanumeric characters, the printing press, and Renaissance perspective drawing. The telegraph sparked the "electric retribalization of the West," a long slide into an immersive electronic sea of mythic participation and collective resonance. But McLuhan also saw this "outering" as the technological roots of the age of anxiety. "To put one's nerves outside," he wrote, "is to initiate a situation -- if not a concept -- of dread."

Because the self is partly a product of its communications, new media technologies remold the boundaries of being. As they do so, the shadows, doppelgangers, and dark intuitions that haunt human identity begin to leak outside the self as well -- and some of them take up residence in the emerging virtual spaces suggested by the new technologies. Spiritualism, for example, was bound up from the get-go with the telegraph: the knocks and rappings that passed back and forth between the Fox sisters and the dead peddler in their Hydesdale cottage in 1848 were spectral echoes of the dots and dashes then hurtling through wires across the land. During the 1850s, the movement's most popular newspaper was called The Spiritual Telegraph, and Spiritualists like Allan Kardec and scientists like Michael Faraday both looked to electricity to explain the raps, creaks, and table-hops that occurred during seances. By the 1860s and 70s, mediums had become the professional pop stars of the Victorian era, and attendees were treated to occult sideshows, as tables rapped and danced across the room, and gooey ectoplasm materialized out of thin air, and musical instruments played creepy jigs in the dark -- apparently all by themselves.

Sound clearly plays a privileged role in both manifesting and mystifying electricity. According to one contemporary account, the "Finale" of a Boston lecture given by representatives of the Edison Company in 1887 was nothing less than a seance: "Bells rung, drums beat, noises natural and unnatural were heard, a cabinet revolved and flashed fire, and a row of departed skulls came into view." And when Alexander Graham Bell and Thomas Watson gave demonstration lectures for the telephone, the two men also conjured up tricks that delivered all the thrills and chills of a magic show.

The telephone always possessed a kind of shadow side. Though Bell came up with the notion of translating the vibrating pressures of the human voice into an electrical signal that could pass along a wire, Watson actually built most of the man's early devices. Like a lot of the electrical hackers of the time, Watson combined loads of practical know-how with weak and frequently wacky theories about the mysterious fluid itself -- electricity is an experience before it is a fact, a dream before it is a science. In Watson's case, electrical theories were mixed up with Spiritualist notions. Watson treated Spiritualism as a non-mystical science, and he initially concluded that, just as "a telegraph instrument transforms pulsations of electricity into the taps of the Morse code," so too did mediums transform energetic radiation into raps and knockings. He also believed spirits from the other side were helping the telephone along. And why not? We associate sentient life with what communicates, and here was an inert thing full of voices. As the emperor of Brazil exclaimed when he first heard the gadget: "My God, it talks!"

A similar shock, impossible for us to reconstruct, awaited folks first confronted with the phonograph. The telephone had already transformed sound waves into the fluctuations of an electric current, but Thomas Edison discovered that changing an electric current in a stylus changed the amount of friction the stylus exerted on a rotating cylinder -- which could therefore become a medium of sonic inscription. Though Edison himself was a most practical man, he was also something of a techno-spiritualist, and later attempted to build a radio device capable of capturing the voices of the dead. Such desires would persist, sublimated and not, throughout the twentieth century. The Swedish researcher Konstantin Raudive claimed that magnetic tape recordings of silence often turn out, on repeated listening, to contain distinct voices, and contemporary devotees of Electronic Voice Phenomenon have tuned into similar murmurs on non-broadcast radio frequencies, some of which are interpreted as messages from beyond the veil.

These dreams and sonic phantasms are not just kookery; they are what Kodwo Eshun would call "sonic fictions," arising in the virtual spaces carved out by electrical media. By siphoning a bit of the soul into an externalized device, such technologies triggered the ancient dread of the doppelgänger, that psychic simulacrum of the self that moves through the world of its own eerie accord. Freud dubbed the dread produced by the doppelgänger "the uncanny," which he connected to the queer feelings one gets from dolls and automata. It seems important to note that when Edison was imagining possible applications for his new device, one of his first notions, alongside producing platters of music, was to make dolls "speak sing cry & make various sounds."

Electricity had still other tricks up its sleeve. In the 183Os, the great British experimental scientist Michael Faraday discovered that changing the electrical current in a wire coil somehow induced an energetic fluctuation in a nearby coil. This decidedly bizarre action-at-a-distance, which came to be called electromagnetic induction, is the driving force behind electrical power plants to this day. For his part, Faraday explained the rather mysterious force connecting the two coils as a "wave of electricity." Pointing to the strange patterns that iron filings create around the end of a magnet, Faraday also suggested that electromagnetic "fields" consisted of "lines of force," vibrating patterns that spread throughout space. Though Faraday initially considered these undulating images of fields and lines of force as nothing more than useful fictions, he gradually accepted them as a basic description of reality.

In the 1860s, James Clerk Maxwell translated Faraday's experimental findings into the language of mathematics, synthesizing optical, magnetic, and electrical phenomena into four magnificent equations that governed the whole of electromagnetic reality. In doing so, Maxwell predicted the existence of the electromagnetic spectrum whose waves we now exploit for everything from broadcasting Puff Daddy to reheating meat loaf to analyzing the chemical composition of Alpha Centauri. Einstein later called Faraday and Maxwell's work the "greatest alteration in the axiomatic basis of physics -- in our conception of the structure of reality." Their electromagnetic universe set the stage for the final deconstruction of atomic materialism: the dissolution of the ether, the emergence of Einsteinian space-time, and ultimately the arrival of quantum mechanics and its colossal oddities. The corporeal cosmos melted into an immense sea of vibrations and insubstantial forces.

Metaphorically speaking, Faraday and Maxwell's model was also intensely musical, though its music was very different from the tonal structures of Western music -- structures which, perhaps not coincidentally, began to dissolve just as the new model of the universe entered popular consciousness. Towards the end of the century, wireless hackers like Marconi and Tesla make direct technological contact with the invisible radio waves theoretically limned by Maxwell. In 1899, after five years of fiddling around with induction coils, batteries and primitive aerials (some of which he hung from balloons), Guglielmo Marconi equipped two ships with radio gear that issued speedily telegraphed reports on the yacht race for the America's Cup. This little sports thrill captured the world's imagination, and the twentieth century can be said to have started on a wireless note. As Simon Reynolds notes, wireless telegraphy also served as a kind of sonic prophecy: those monotone Morse beep-beep-beeps that once signified news now sound like dance music.

Marconi's wireless flowered into radio, which in its first few decades reproduced a pattern of intense technical development and prophecies about world peace and democratic communication that sound eerily familiar in the Internet 90s. Moreover, early radio attracted legions of hackers, teenage and otherwise, who endowed their homebrewed crystal sets with an undeniable charge of experiment and anarchic play. For the first few decades of radio's life, hobbyist weenies across the globe chatted up a storm while making important discoveries about the spectrum, especially on the short-wave side of things. By the 1920s, federal and commercial interests began stringing barbed wire across the many-to-many spectrum, professionalizing and segmenting the formerly free-range medium.

Even as the airwaves were filling up with ads for laundry soap, radio freaks continued to hear some seriously otherworldly stuff in their primitive headphones. Thomas Watson got an early taste of these unearthly transmissions late at night in Bell's lab, when he would listen to the snaps, bird chirps, and ghostly grinding noises that popped up on a telephone circuit: "My theory at this time was that the currents causing these sounds came from explosions on the sun or that they were signals from another planet. They were mystic enough to suggest the latter explanation but I never detected any regularity in them that might indicate they were intelligent signals." As Avital Ronell points out that, Watson may have been the first person to listen to noise. Though the sounds he heard may well have had terrestrial origins, Watson made the crucial recognition that human ears could now directly register cosmic vibrations.

Watson was by no means the only electrohead to believe he was picking up play-by-plays from other planets. During the summer of 1899, when Nikola Tesla manufactured lightning and dreamed of broadcasting wireless power across the globe, the inventor also started picking up regular signals on his 200 foot radio tower in Colorado, and tentatively concluded that he was "the first to hear the greeting of one planet to another." For decades, many early radio operators continued to pick up powerful, persistent and seemingly unexplainable signals, some of which were reported to be rather Pynchonesque repetitions of the Morse code for v. Marconi himself claimed to have received such signals on the low end of the longwave spectrum, and in 1921 flatly declared that he believed they originated from other civilizations in space. On August 24, 1924, when Mars passed unusually close to the earth, civilian and military transmitters voluntarily shut down in order to leave the airwaves open for the Martians; radio hackers were treated to a symphony of freak signals.

These popular passions may seem corny in retrospect, but that is because the sublime and visionary edge of technology is always changing, opening up new virtualities that then become integrated into business as usual. For eons, the hardwired side of human perception has been limited to our own unique sensory apparatus, an apparatus that partly determines the apparent nature of the world. New technologies of perception unfold new worlds of sublimity and threat, worlds which challenge us to reconfigure the limits of ourselves and to shape the meaning of the new spaces we find ourselves in. When ocular instruments extended human sight into Galileo's heavens and Robert Hooke's microscopic cellular regimes, they installed new explanatory spaces for the universe, spaces which reorganized the meaning of the cosmos and the actors in it.

But what kind of "space" does our expanded encounter with electricity and the electromagnetic spectrum lead us into? Though the spectrum includes the wavelengths of visible light, and X-rays, ultrasound, and radio astronomy can all be used to illuminate new dimensions of the universe, the essence of electromagnetism is invisible. In one of his more suggestive intuitions, Marshall McLuhan argued that electronic technologies were installing an "acoustic space" in the place of an earlier "visual space" -- the linear, logical and sequential conception of the world that had dominated Western consciousness for many centuries. McLuhan believed that electronic media eroded this crisp and objective grid of facts, dissolving it into a psychic, social and perceptual environment that resembles the kind of space we hear: multi-dimensional, resonant, invisibly tactile, "a total and simultaneous field of relations." Though McLuhan used "acoustic space" as an analogy for a psycho-social process that did not necessarily tickle the bones of the inner ear, his oceanic vision of acoustics does foreground the central role that music -- and its electromagnification -- would play in mapping and constructing pleasure and perception in the first fully technological century.

This secret sympathy between music and the electromagnetic imaginary was first intuited in the 1600s by the Jesuit alchemist Athanasius Kircher, who identified certain vibrating musical tones as "magnetic." Kircher also invented the glass harmonica, an instrument that exploited the resonant tones produced by rubbing glass tumblers filled with water. Kircher's researches were carried on by the animal magnetist Franz Anton Mesmer, known today either as the king of charlatans or the man whose healing journeys into the netherworlds of the mind inadvertently spawned psychoanalysis. Mesmer believed that animal magnetism was "communicated, propagated and intensified by sound," and, as the liner notes to Ash's 1995 compilation Mesmer Variations point out, used to improvise on a version of Kircher's glass harmonica in order to set the mood in his healing salons. One visiting Viennese doctor described the "shiver through my nerves caused by the instrument," and suggested that "many of the phenomena of magnetism must have been brought out by the extremely penetrating tones of this music."

For us, Mesmer might serve as a utopian figure -- half comic, half cosmic, experimental and underground -- for the continued promise of electroacoustic phenomena in a world ravaged by technologies with far more violent and banal issue. Along with cinema, twentieth-century music has become one of the principle esthetic zones where humans have used innovative gadgetry to make sense -- and nonsense -- of their own increasingly technologized souls. Musicians and composers both highbrow and pop have twiddled and tweaked electronic and electrical instruments, as well as electromagnetic recording and broadcasting technologies, in order to tune into new sonic, compositional, and expressive possibilities. In so doing, they have also gone a long way toward reimagining the scrambled boundaries of subjectivity as it makes its way through the invisible landscapes -- both dreadful and sublime -- that make up the acoustic space of electronic media.

From techgnosis.com