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Archimedes Death Ray in San Francisco
Monkey-Man2000 writes "Following the recent demonstration by MIT students that Archimedes' death ray could have been used to burn Roman ships, the producers of the Discovery Channel's Myth Busters invited the MIT team to San Francisco to try their death ray on an 80-year old fishing boat. This time, even with perfect weather, they were unable to set the boat afire. From the article, "Peter Rees, executive producer of "Myth Busters," said the experiment at the Hunters Point Shipyard showed that Archimedes' death ray was most likely a myth.""
Having failed to do the experiments once and declare the thing as "most likely a myth"! Even today, many, if not most, of the experiments are non-replicable. Well, for most cases they are probably myths or hoaxes, but some of them are genuinely very hard to replicate. The reason can range from precision requirements to hazy details. The latter is the usual suspect, which, I believe, applies in this case as well.
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"Hyneman has a degree in Russian language and literature. He has had a variety of careers, including scuba diver, wilderness survival expert, boat captain, linguist, pet shop owner, animal wrangler, machinist and chef."
"Adam Savage: Before becoming a TV host, he spent 10 years as an artisan in special effects, specifically modelmaking for companies such as Industrial Light and Magic, Warner Bros. and Disney. He worked on such films as Star Wars Episodes I and II, The Matrix sequels, Bicentennial Man, A.I., Space Cowboys, and others.
He has also been an animator, graphic designer, carpenter, set designer, toy designer, rigger, and has many sculptures on display in museums across the country."
http://en.wikipedia.org/wiki/Adam_Savage
http://en.wikipedia.org/wiki/Jamie_Hyneman
Remember that 7-Up commercial from a couple'a years back? The one that features a 7-Up machine on treads that rolled around and fired cans of soda at people?
Jamie built that.
His company, M5 Industries Inc., specializes in robotic designs for visual effects. He's got a lot of experience building, you know, robots. He's designed or been involved in designing things that are required to do a huge variety of bizarre and wacky things - from the aforementioned surly soda-firing vending machine robot to a motorized shoe-cycle to a articulated giant hand (as seen in the film Monkeybone).
And, to remind those of you who watched Battlebots when it was on:
He built Blendo.
So, yes, he's got engineering experience. He's got a lot of engineering experience. And, yes, special and visual effects work *does* require a lot of skill and talent - and the ability to judge whether something is practicable in the field.
(I'd also recommend that you look at the career of one James "The Amazing" Randi before commenting further. Take an especially close look at how often people claim that a stage magician shouldn't be trying to debunk so-called "real" paranormal events.)
http://web.mit.edu/2.009/www/lectures/10_Archimede sFAQ.html#FAQi
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If you bothered to read the FAQ, you would see that he agrees with the MythBusters conclusion. The mirrors need to be aligned VERY precisely AND the device needs to be within A FEW FEET of the object to be destroyed. Yes, the device works, but it is not a ship destroyer.
Although the LEGO pirate ship managed to last just 16 minutes...
Hi.... It's my first post here..... I really like this site! Now.... The other thing to remember is that at the time of Archimedes, good quality glass was not discovered yet - most mirrors at the time were made from malachite. Such a mirror would not have reflected nearly the amount of light that a modern glass mirror would have done. Good quality glass did not come into Rome until about 250 years after Archimedes. I actually looked into this pretty carefully for my book "The Light of Alexandria" - http://www.lightofalexandria.com/ . Some of the other inventions that Archimedes made for the defense of Syracuse were pretty amazing, though........ JM
This is why you don't put your faith in freshmen (or 1/3 of the stuff in medical journals, but that's a separate issue).
Fair enough but the MIT team did achieve ignition using fixed mirror placements and just 127 flat 1 square foot mirrors.
The 'freshmen' failed because there was no visual reference point for aiming. When 100 other 'bright spots' are aiming at the same target you, there is no way of telling which bright spot is yours so it's impossible to make the proper adjustments to focus your beam onto the target.
So, the only real constraint is providing a means of manually aiming the mirror properly. I'm not an optics expert...but if there's a way to design a sighting device, perhaps like a sextant, then the myth of 3000 soldiers with 5'-square bronze shields incinerating a ship could easily be true.
(1 square foot)X127=127(MIT achieved ignition with this, roughly 1100 F)
vs.
(5 square feet)X3000=15,000(Grecian army w/ bronze shields)
That's a massive magnification factor of about 120X. 120X the ignition luminance(cd/m2) could vaporize the target instead of igniting it.
The government has a defect: it's potentially democratic. Corporations have no defect: they're pure tyrannies. -Chomsky
When completed in 1978, the National Solar Thermal Test Facility cost just over $21 million. The NSTTF is an array of 222 focusable mirrors, or heliostats, covering 8 acres (7 football fields), located on the grounds of Sandia National Laboratory at the edge of Albuquerque, New Mexico.
The mirrors (facets) are focused onto a receiver or target mounted on a tower. The NSTTF tower is 200 feet tall, and its 8-foot-thick foundation is 50 feet below ground. The mirrors can direct up to 5 megawatts of solar radiation onto the receiver or other experimental objects. An uncooled object placed in the beam can be quickly raised to temperatures of over 4000 degrees F.
The mirrors are mounted on individual frames that are tipped up and down and rotated east to west by small motors much like those used in electric clocks. The motors are controlled by a computer which determines how to position each heliostat so that its reflection hits the receiver at any time of the day and any day of the year. The mirrors are made of two layers of glass with reflective silver between the glass layers. The quality of the glass is like that in your windows at home. The silver in one heliostat (25 mirrors-in one frame) weighs only about 1 ounce. Rain, snow, and other natural forms of moisture actually help keep the mirrors clean by washing away accumulated dust. Hail and dust storms have not harmed the mirrors. Only hail over 1 inch in diameter is likely to break the mirrors.