“This machine has the ability to inflict limitless, unbearable pain.”

This machine is really cool.  Developed by a Raytheon, it is called the “Silent Guardian.”  And it creates the most intense pain, but does no damage to the body:

I tested a table-top demonstration model, but here’s how it works in the field.

A square transmitter as big as a plasma TV screen is mounted on the back of a Jeep.

When turned on, it emits an invisible, focused beam of radiation - similar to the microwaves in a domestic cooker - that are tuned to a precise frequency to stimulate human nerve endings.

It can throw a wave of agony nearly half a mile.

Because the beam penetrates skin only to a depth of 1/64th of an inch, it cannot, says Raytheon, cause visible, permanent injury.

But anyone in the beam’s path will feel, over their entire body, the agonising sensation I’ve just felt on my fingertip. The prospect doesn’t bear thinking about.

“I have been in front of the full-sized system and, believe me, you just run. You don’t have time to think about it - you just run,” says George Svitak, a Raytheon executive.

Silent Guardian is supposed to be the 21st century equivalent of tear gas or water cannon - a way of getting crowds to disperse quickly and with minimum harm. Its potential is obvious.

This could be a very effective way of dispersing a crowd, but the writer of the article seems to believe that no good can come of this machine.

Silent Guardian and the Taser are just the first in a new wave of “non-lethal” weaponry being developed, mostly in the U.S.

These include not only microwave ray-guns, but the terrifying Pulsed Energy Projectile weapon. This uses a powerful laser which, when it hits someone up to 11/2 miles away, produces a “plasma” - a bubble of superhot gas - on the skin.

A report in New Scientist claimed the focus of research was to heighten the pain caused by this semi-classified weapon.

And a document released under the U.S. Freedom of Information Act talks of “optimal pulse parameters to evoke peak nociceptor activation” - i.e. cause the maximum agony possible, leaving no permanent damage.

Perhaps the most alarming prospect is that such machines would make efficient torture instruments.

They are quick, clean, cheap, easy to use and, most importantly, leave no marks. What would happen if they fell into the hands of unscrupulous nations where torture is not unknown?

The agony the Raytheon gun inflicts is probably equal to anything in a torture chamber - these waves are tuned to a frequency exactly designed to stimulate the pain nerves.

I couldn’t hold my finger next to the device for more than a fraction of a second. I could make the pain stop, but what if my finger had been strapped to the machine?

Dr John Wood, a biologist at UCL and an expert in the way the brain perceives pain, is horrified by the new pain weapons.

“They are so obviously useful as torture instruments,” he says.

That’s true, but so are pointed sticks.  And the beauty is that no one is injured by the machine.  They just run away from it.