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    » Greece: X-rays reveal defaced genius of Archimedes

    Published 2006-08-07
    Researchers at Stanford University's Linear Accelerator Center in Menlo Park have been using X-rays this month to decipher a fragile 10th Century manuscript that contains the only copies of some of Archimedes' more important works. The X-rays, generated by a particle accelerator, cause tiny amounts of iron left by the original ink to glow without harming the delicate goatskin parchment.

    "We are gaining new insights into one of the founding fathers of Western science," said William Noel, curator of manuscripts at Baltimore's Walters Art Museum, which organized the effort. "It is the most difficult imaging challenge on any medieval document because the book is in such terrible condition."

    After a successful trial last year, Stanford researchers invited X-ray scientists, rare document collectors and classics scholars to take part in the 11-day project.

    It takes about 12 hours to scan one page using an X-ray beam about the size of a human hair, and researchers expect to decipher up to 15 pages that resisted modern imaging techniques. After each new page is decoded, it is posted online for the public.

    On Friday, members of the public watched the decoding process via a live Webcast arranged by the San Francisco Exploratorium.

    "We are focusing on the most difficult pages where the scholars haven't been able to read the texts," said Uwe Bergmann, the Stanford physicist heading the project.

    Born in the 3rd Century B.C., Archimedes is considered one of ancient Greece's greater mathematicians, perhaps best known for discovering the principle of buoyancy while taking a bath.

    The 174-page manuscript, known as the Archimedes Palimpsest, contains the only copies of treatises on flotation, gravity and mathematics. Scholars believe a scribe copied them onto the goatskin parchment from the original Greek scrolls.

    Three centuries later, a monk scrubbed off the Archimedes text and used the parchment to write prayers at a time when the Greek mathematician's work was less appreciated.

    In 1998, an anonymous private collector paid $2 million for the manuscript at an auction, then lent it to the Walter Arts Museum for safekeeping and study.

    Over the past eight years, researchers have used ultraviolet and infrared filters, as well as digital cameras and processing techniques, to reveal most of the buried text.

    "We will never recover all of it," Noel said. "We are just getting as much as we can, and we are going to the ends of the Earth to get it."



    http://www.chicagotribune.com/news/nationworld/chi-0608070191aug07,1,147117.story?coll=chi-newsnationworld-hed&ctrack=1&

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